AAMOF - As A Matter Of Fact
AFAIK - As Far As I Know
AFK - Away From Keyboard
ASAP - As Soon As Possible
BBL - Be Back Later
BRB - Be Right Back
BTW - By The Way
CU - see you
CUL8R - see you Later
EZ - Easy
F2F - Face to Face
FAQ - Frequently Asked Questions
FWIW - For What It's Worth
FYI - For Your Information
GAL - Get A Life
GG - Good Game
GTG - Got To Go
HAND - Have A Nice Day
HTH - Hope That Helps
IAC - In Any Case
J/K - Just Kidding
IMHO - In My Humble Opinion
IMNSHO - In My Not-So-Humble Opinion
IMO - In My Opinion
IOW - In Other Words
IRL - In Real Life
LOL - Laughing Out Loud
NRN - No Reply Necessary
OMG - Oh My God
OTOH - On The Other Hand
R & D - Research and Development
ROFL - Rolling On the Floor Laughing
ROFLMAO - Rolling On the Floor Laughing My @@@ Off
THX - Thanks
TIA - Thanks In Advance
TTYL8R - Talk To You Later
WTF - What The F**k
2M - tomorrow
2nite - tonight
B4 - Before
cos - because
j/k - Just Kidding
K - ok
kewl - cool
l8rz - see you later
m8 - Mate
n/a - Not Applicable
w/ - With
w/o - Without
Some more but some of them are repeated here again...
ASAP - As Soon As Possible
BBL - Be Back Later
BF - Boy Friend
BRB - Be Right Back
BTW - By the Way
BWL - Bursting with Laughter
CRS - Can't Remember Sh**
CYA - See ya
FYI - For Your Information
GF - Girl Friend
GFN - Gone for Now
GMBO - Giggling My Butt Off
GMTA - Great Minds Think Alike
H&K - Hug and Kiss
HHIS - Hanging Head in Shame
IC - I See
JMO - Just My Opinion
KIT - Keep in Touch
KOC - Kiss on Cheek
KOTC - Kiss on the Cheek
L8R - Later
LHM - Lord Help Me
LOL - Laughing Out Loud
LTNS - Long Time No See
OMG - Oh My God!
PM - Private Message
PMP - Peed My Pants
Poof - Has Left the Chat Room
RL - Real Life
RT - Real Time
ROFL - Rolling On Floor Laughing
ROFLMTO - Rolling On Floor Laughing My Tail Off (BT's personal favorite)
SETE - Smiling Ear to Ear
SHID - Slaps Head in Disgust; Egads... I could have had a V-8
SWAK - Sealed with a Kiss
SYS - See You Soon
TTFN - Ta Ta for Now
TTYL - Talk to You Later
WB - Welcome Back