AFAIK = As Far as I Know
AFK = Away From Keyboard
AKA = Also Know as
ASAP = As Soon as Possible
ASL = Age, Sex, Location?
B4 = Before
BAK = Back at Keyboard
BBL = Be Back Later
BBS = Be Back Soon
BRB = Be Right Back
BTDT = Been There Done That
BTW = By The Way
CFV = Call for Votes
CUL = See You Later
DYJHIW = Don't You Just Hate it When...
EOM = End of Message
F2F = Face to Face
FAQ = Frequently Asked Question
FC = Fingers Crossed
FUBAR = Fouled Up Beyond All Recognition
FWIW = For What It's Worth
FYA = For Your Amusement
FYI = For Your Information
GA = Go Ahead
HH = Holding Hands
HHOJ / K = Ha Ha, Only Joking / Kidding
HIWTH = Hate it When That Happens
GR&D = Grinning, Running & Ducking
IAE = In Any Event
IANAL = I Am Not a Lawyer
IDK = I Don't Know
IITYWTMWYBMAD = If I Tell You What This Means Will You Buy Me a Drink?
IMCO = In My Considered Opinion
IMHO = In My Humble Opinion
IMNSHO = In My Not So Humble Opinion
IMO = In My Opinion
IOW = In Other Words
IRL = In Real Life
IYKWIM = If You Know What I mean
JAM = Just a Minute
JASE = Just Another System Error
J/K = Just Kidding
KOTC = Kiss on the Cheek
L = Laugh
L8R = Later
LMAO = Laughing My @$$ Off
LOL = Laugh Out Loud
NNTP = Network News Transport Protocol
NRN = No Reply Necessary
OBTW = Oh, by the Way
OIC = Oh, I see
OTOH = On The Other Hand
OT = Off Topic
PITA = Pain In The @$$
PLZ = Please
PMFJI = Pardon Me for Jumping in
ROFL = Rolling on The Floor Laughing
RSN = Real Soon Now
RTFN = Read The Freaking Manual (or Message)
SITD = Still In The Dark
SNAFU = Situation Normal, All Fouled Up
SOL = $h*t Outta Luck
STFU = Shut The Freak Up
SYL = See You Later
TANSTAAFL = There Ain't No Such Thing as a Free Lunch
TGIF = Thank God it's Friday
TIA = Thanks in Advance
TIC = Tongue in Cheek
TLA = Three Letter Acronym
TNX = Thanks
TTFN = Ta Ta For Now
TTYL = Talk to You Later
USB = Universal Serial Bus
WB = Welcome Back
WRT = With Regard to
WTG = Way to Go
YMMV = Your Mileage May Vary