AFK -- Away from keyboard
AFAIK -- As far as I know
AKA -- Also known as
ASAP -- As soon as possible
B4 -- before
BBL -- Be back later
BBS -- Be back soon
BRB -- Be right back
BTW -- By the way
BG -- Big Grin
CU -- See you
EG -- Evil Grin
FAQ -- Frequently asked Questions
IM -- Instant Message (see also PM)
IMHO -- In my humble opinion
IMO -- In my opinion
IRC -- Internet Relay Chat
KOTC -- Kiss on the cheek
LDR -- Long Distance relationship (often used for cyberrelationship)
LOL -- Laughing out loud
LMAO -- Laughing my ass off
LMAOCTC -- Laughing my ass off confusing the cat
PITA -- Pain in the ass
PM -- Private Message (also Private Mail)
ROTFL -- Rolling on the floor laughing
ROTFLMAO -- Rolling on the floor laughing my ass off
RTFM -- Read the f*cking manual
RFD -- Reqeust for Discussion
RFC -- Request for Comment
SS -- Sweet Smile
SCNR s-- orry couldnґt resist
TIA -- Thanks in advance
THX -- Thanks
RT -- Real time time, also r/t, r/l (real life)
VT -- Virtual time, also v/t, v/l (virtual life)