Here is the list of acronyms you may find on DDN. If you have any more post them an I'll merge them into the big list. One's that exist purely to take the mickey out of a particular user will not be added

AFAIK - As far as I know
AY*iD - Are you *name of individual* in disguise
BB - Bill's Bitch
BOC - Boring Old Codger/fanny
BOFH - swine operator from hell
brb - Be right back
Btw - By the way
BYO - Build Your Own
CBA - Can't be arsed
CIGAW? - Can I Get A Witness?
CYA - cover your bum
DDN - Dotdragnet
DGAF - Doesn't Give a screw
DH - 'Darling' Husband
DIGTBK - Damn, it's good to be king!
FAF - Funny As screw
FFS - For Fucks Sake
FOAD - screw off and die
FOC - Free of charge
FTL - For the lose
FTW - For the win
FUBAR - buggered Up Beyond All Recognition
FWIW - For What It's Worth
FYI - For Your Information
GACMB - Giggle And Clench My Buttocks (Julieism)
GAFL - Get A Fooking Life
GAPB - Get a Proper Browser
GAPOS - Get a proper O/S
GTD - Going To Die (Mantisism)
gtf - get tae screw / go to screw
GTH - Go to H*ll
GWS - Get Well Soon
HB - Happy Birthday
hth - Hope this helps
ICBIFL - I could build it for less!
ICHS - I can honestly say
IHDY - Is He Dead Yet?
IIC - If I'm correct
IIRC - If I Remember Correctly
ILB - I Like Boobies!
IMHO - In My Humble / Honest Opinion
IMO - In My Opinion
IOW - In other words
ISDY - Is She Dead Yet?
ITT - In This Thread
IYKWIM - If You Know What I Mean
iykwimaityd - if you know what i mean and i think you do
IYSWIM - If You See What I mean
JHFC - Jesus H. flamin' Christ!!!
JIC - just in case
jmo - just my observation
jttbh - just trying to be helpfull
JW - Just Wondering/Wondered
L,P or STFU - Link, Pic or Shut The screw Up
LH*IRT - Let's Hope *name of individual* Isn't Reading This
ligaf - like i give a screw
LIGaFF - Like I give a Flying screw
np - No Problem
OP - Original Poster
OT - Off Topic
OTOH - On The Other Hand
OTT - Over The Top
PITA - pain in the bum
POV - point of view
ROFLMAO - Rolling On The Floor Laughing My bum Off
RTFM - read the flippin manual
SNAFU - Situation Normal All buggered Up
STBY - sucks to be you
STFU - Shut The screw Up
SWIDT - See what I Did There?
tbh - to be honest
TIA - Thanks In Advance
TVM - Thank-You Very Much
TY - Thank you
VoE - Voice of Experience
wagt - What a Gay Thread
WB - Welcome Back
WFM - Works for me
WGAF? - Who Gives a screw?
WHS - What He Said
WRT - With reference to
WSD? - Want some disks?
WSS - What She Said
WTF - What The F***
YAFR? - You're a fag, right?
YATB - You are talking bollox
YAWfO - Yet Another Woosh for Ory
YGDR? - You've got disks, right?
YGW - your gay what?
YGWYPF - You Get What You Pay For
YKIMS - You Know It Makes Sense
YMMV - your mileage may vary
yyy - The Lady Doth Protest too much