From: http://www.tux.org/lkml/
http://www.tuxedo.org/~esr/jargon/html/entry/PFY.html
AFAIK = As Far As I Know
AKA = Also Known As
ASAP = As Soon As Possible
BTW = By The Way (used to introduce some piece of information or question that is on a different topic but may be of interest)
COLA = comp.os.linux.announce (newsgroup)
ETA = Estimated Time of Arrival
FAQ = Frequently Asked Question
FUD = Fear, Uncertainty and Doubt
FWIW = For What It's Worth
FYI = For Your Information
IANAL = I Am Not A Lawyer
IIRC = If I Recall Correctly
IMHO = In My Humble Opinion
IMNSHO = In My Not-So-Humble Opinion
IOW = In Other Words
LART = Luser Attitude Readjustment Tool (quoting Al Viro: "Anything you use to forcibly implant the clue into the place where luser's head is")
LUSER = pronounced "loser", a user who is considered a to indeed be a loser (idiot, drongo, wanker, dim-wit, fool, etc.)
OTOH = On The Other Hand
PEBKAC = Problem Exists Between Keyboard And Chair
ROTFL = Rolling On The Floor Laughing
RSN = Real Soon Now
RTFM = Read The Fucking Manual (original definition) or Read The Fine Manual (if you want to pretend to be polite)
TANSTAAFL = There Ain't No Such Thing As A Free Lunch (contributed by David Niemi, quoting Robert Heinlein in his science fiction novel 'The Moon is a Harsh Mistress')
THX = Thanks (thank you)
TIA = Thanks In Advance
WIP = Work In Progress
WRT = With Respect To