Arctic Wagon's Abbreviations List, it was originally available at the Myst Online forums.

(Items not Uru-related but useful in the communication with other players are in grey)

Side note: Abbreviation, with a #, means that different people have different definitions

Last Updated: Aug 23th, 2008.

Abbreviations List.

831 - I Love You (8 letters, 3 words, 1 meaning)
88 - Bye Bye
88888888 - Clapping
10q - Thank you

ABM - Uru: Ages Beyond Myst (original single player game)
ADM - Anti DRC Movement
AFAIK - As Far As I Know.
AFK - Away From Keyboard
AKA - Also Known As
ASAP - As Soon As Possible
ATM - At The Moment
AWOL - Absent Without (Official) Leave

B4 - Before
BBIB - Be Back In A Bit
BCNU: - Be seein' you
BFN - Bye For Now
BCO - Baron's City Office. Also known as Sharper's Office -- the one in D'ni, not the one with the fish tank.
BoA - Book of Atrus
BoD - Book of D'ni
BoT - Book of Ti'ana
bot: - Any type of automated software in chatrooms and web-cataloging software
BRB Be Right Back
BSA - Black Screen Age. A bug in the game when you get a black screen when loging in or linking between two locations.
BSOD - The Blue Screen of Death (BSOD, bluescreen, or stop error) is an error screen displayed by certain operating systems, most notably Microsoft Windows
CAT - Cavern Activities Team
CC - (Uru) Complete Chronicles
CCN - Cavern Communications Network (includes TCT)
CGZM #1 - Calibration Great Zero Marker.
CGZM #2 - Cathedral Great Zero Marker (refers to "yellow" markers for missions found in the GZ "Cathedral" or back area)
CTD> - Crash to Desktop.
CU - See you (later)
CYA - See ya

DFTT - Don't feed the trolls
DJC - D'ni Jazz Club
DMC - Dutch MYST Community
DND - Do not disturb
DRC - D'ni Restoration Council
DRCL - DRC Liasions
DZS - D'ni Zoological Society

EOF - End of File
EOM End of Message
ETA Estimated time of arrival

FAQ - Frequently Asked Question(s)
FWIW - For what it's worth
FYIFor your information

GBTW Get back to work
GD - GreyDragon. A being who weilds massive amounts of power. (re: Cyan and one of the Forums Masters)
GDC: - Game Designer Conference
GFU - Good for you
GJ Good job, often used in online gaming when a teammate performs an act benefitting his team, such as killing an opponent or enabling that kill
GoA - Guild of Archivists:
GoAs - Guild of Astronomy
GoC - Guild of Cartographers
GoC - Guild of Caterers
GoCo, GoCom - Guild of Comedy
Go FA - Guild of Fine Artists
GoG - Guild of Greeters
GoH - Guild of Healers
GoI - Guild of Ideas
GoI - Guild of Imaginists
GoM - Guild of Musicians
GoMa - Guild of Maintainers
GoMe - Guild of Messengers
GoW - Guild of Writers
Gratz - Congratulations
GT- Gametap
GTG Got to go
GZ - Great Zero (area in the D'ni cavern)
GZA - Great Zero Antichamber (same as Great Zero Observation)
GZC #1 - GZ Courtyard after your first 15 markers
GZC #2 - GZ Cathedral (through Great Zero link in Personnal links at Nexus))
GZCC - Great Zero Calibration Center
GZM - Great Zero Marker. (generally refers to the first two "red/green" marker sets)
GZO - for GZ Observation. (same as Great Zero Antichamber)

HAND - Have a nice day
HF - Have fun
hk - Havok
hs - HeadSpin (which was bought by Cyan to develop the Plasma Engine)

IC - In cavern: playing in a You-Are-You. The player is playing as an extension of himself but playing as if the D'ni reality is real. Also called, "In Character"
IMHO - In My Humble Opinion.
IOW - In other words
IRC - Internet Relay Chat
IRL - In real life
ITYM - I Think You Mean
IYKWIM - If you know what I mean

JAS - Just a sec
JFTR - Just for the record
JK or j/k - Just kidding, or joke

KISS - Keep it simple stupid.
KTHX - OK, thanks
KTHXBAIOK, thanks, goodbye, used either to cut short a conversation or to express displeasure with being cut short

L8R - Later, L8R also sometimes abbreviated as L8ER is commonly used in chat rooms and other text based communications as a way of saying good bye.
LESS - Looking to Explore Something Soon
leet - Often spelled as l33t or 1337. It originally meant elite
LFG - Looking for group
LFM - Looking for more
LMK Let me know
LMP Liaison's Meeting Place (a forum at the Guild of Messengers)
LOL - Laugh out loud
LTD- Link To Desktop - commonly cited with Uru Live, when someone would be in-game, their game would crash, and they'd come back into the game, they'd say to anyone they were talkign to before the crash "Sorry, my avatar decided to LTD."
LTNS - Long time no see
Luff - Intentional misspelling of love. Less extreme than love.
LYLAB - Love you like a brother.
<LYLAS - Love you like a sister.

M8 - Mate
MC - MYST Community
MYAOF - My Hairs Are On Fire
ML - MYSTlore (a mini wiki, info site)
MM - Marker Mission.
MMO - Massively multiplayer online
MO #1 - Myst Online (Uru Live)
MO #2 - The website Myst Obsession (shared with Uru Obsession).
MORE- - Myst Online Restoration Experiment
MOUL or MO:UL - Myst Online: Uru Live
MOTD - Message of the day
MTFBWY - May The Force be with you
MUD: - Multi-User Dungeon
MUSH - Multi-User Shared Hallucination
MYOB - Mind your own business

N1 - Nice one
NE1 - Anyone
NM (Sometimes written N/M) - Not much, Never mind or no message, used on message boards or in e-mails to indicate that everything is already said in the subject line.
HP - No problem
HSWF - Not safe for work. Warning about content that may get the viewer in trouble with his employer or co-workers.
NPC - Non-player character
NVM, NVMD, or nm: - Nevermind, not much

ODE - Open Dynamics Engine
OHEMGEE - Spelled out form of OMG.
OIC - Oh, I see
OMG - Oh my goodness
ONOZ - Oh, no
OOC - The player is playing the game as merely a game. The player acts as if You-Are-You is sitting at a computer playing a game. Also called "Out Of Character"/"Out of Cavern"
OP - Original Poster
O RLY - Oh really?
OS - Operating system
OT - Off topic
OTOH - On the other hand

P2P - 1) Peer to peer, 2) pay to play
PAW - Parents are watching
PLMK - Please let me know
pl - Plasma
POTS or PotS or TPotS- - (The) Path of the Shell expansion pack
POV - Point of view
PPL - People
PTKFGS - Punch the Keys For God's Sake
px - PhysX

QWP - Quit Whining, Please

RAWA- - Richard A. Watson (Cyan employee, eater of donuts, and giver of D'ni words)
RE or Rehi - Hello again
RL - Real Life. An OOC term referring to reality.
Relto'd out - Linked to Relto (used in the context of leaving an area, i.e. "I was chatting with Tweek before he relto'd out.")
ResEng - Restoration Engineers
ROTFL - Rolling on the floor laughing
ROFLMAO - Rolling on the floor laughing my a.. (behind) off
RR - Restoration Realist
RSN - > Real soon now (used sarcastically)

SCNR - Sorry, could not resist
SWF - Safe for Work
sk8/sk8r/sk8er - Skate/skater
SMH - Shaking my head
SOHF - Sense of humor failure

SWN - Spoken Word Night (Wednesday night event in UO 'hood)

<TBF - Time between failures
TBH - To be honest
TCT - The Cavern Today
TG - That's great
TGIF - Thank God it's Friday
TGT - The Great Tree
TIA - Thanks in advance
TMI - Too much information
TOS - Terms of service
TPotS- The Path of the Shell (Uru extension # 3)
TTBOFK - To the best of my knowledge
TTFN - Ta ta for now
TTYL - Talk to you later (also spelled TTUL, T2UL or T2YL)
Ty or Thx - Thank you
TyT - Take your time
TYVM - Thank you very much

U - You
UCC - User Created Content
UL - Uru Live
ULM- Uru Library Manager
UO - Uru Obsession
# Uru CC - Uru Complete Chronicles
# U:CC=Uru: Complete Cronicles (not to be confused with UCC)
UU- Untìl Uru

W8 - Wait
WB - - Welcome back
WIGO - What is going on?
WIP - Work In Progress
W00t, w00T or WOOT - First two express exuberance, the last is a backronym for the term "We Own the Other Team".
W/ or W/O - With or without
WB - Welcome back
W/E - Whatever
WRT - With respect / regard to
WTB - Want to buy
WTG - Way to go
WTH - What the hell
WTS - Want to sell
WTT - Want to trade
WYG - What you got?
WUBU2 - What (have) you been up to?
WUU2 - What (are) you up to?
WYSIWYG - What you see is what you get

xp - expansion pack

YHBT - You have been trolled.
YKW - You know what?
YW - you're welcome
YOYO - You're On Your Own.

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Weird Terms List

As suggested by Islander, I will also start a new list.

Quote:

weird terms that are springing up

A pretty good site to visit as suggested by Whitch2, (Uru Live Moderator), would be the Norfren's Uru Glossary...
https://www.gunda.hu/uru/glossary_moul.htm

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Age(s) - Each alternate universe you get to explore

Bevin - The hood Styled after the original Bevin hood (only neighborhood available right now)

D'ni - An underground cavern in Earth. Also refers to the people who once lived there and their language.

Eddie - The beachball found in Bevin

Ferry - Lower city section also called "Ferry Terminal"
Firemarbles - Small self powered lights. Sometimes seen on the ground in Bevin
Flamer - Someone who makes inflammatory, abusive or directly offensive comments. Similar to, but not quite the same as an Internet troll.

Home page - The website's introduction page, starting point, and guide. The technical term is "index"

Instance - One of a set of identical (or nearly identical) Age areas. Players in different instances will not see or hear each other; changes made in one instance will not affect any other instances. (Example: everyone begins the game in a different instance of Relto.)

lag - Slang term for slow Internet speeds or high Internet latency; lag is sometimes due to a server problem, but more frequently due to the connection between client and server. A slow or intermittent connection; may often be referred to as laggy
Lamer - A know-nothing, one who is lame.
Lattice- The Lattice is the D'ni "computer system" that manages the Nexus and communication with the KIs.
Link/linking - Teleporting from one Age to another

Hood - The small area linked to, from the first book on your bookshelf. (also called "Neighborhood)

Newbie, newb, n00b - An inexperienced user of a system or game, or an annoying person. Usually a derogatory term for someone inexperienced at a game.

Relto - The Age you start out in (in Uru live)
RL: Real Life
rel.to - Rel.to is a portal (Full Directory) to the community in and around Cyan Worlds' adventure and exploration games, the "Myst" and "Uru" series.......http://rel.to/

Smiley - Another name for emoticons
Snail mail - Normal paper mail service

Tweedler - One who has deep love for all computer related technology and gadgets

Uru Prime - Refers to uru:ages beyond myst, the original single player game (without the two expansion packs, Uru to D'ni and The Path of The Shell)