AFAICS As Far As I Can See
AFAIK As Far As I Know
BTW By The Way
FWIW For What It's Worth
HTH Hope That Helps
IANAL I Am Not A Lawyer
IIRC If I Remember Correctly
IME In My Experience
IMO In My Opinion
IMHO In My Humble Opinion
IRL In Real Life
IYKWIM If You Know What I Mean
LMAO Laughing My Arse Off
LOL Laughs Out Loud (or alternatively Lots Of Laughs)
ROFL Rolls On Floor Laughing
RTFM Read The Fudging Manual
TANSTAAFL There Ain't No Such Thing As A Free Lunch
WTF What The Fudge?
YMMV Your Mileage May Vary

BRB – be right back
BTW – by the way
TTYL – talk to you later
BFN – bye for now
TTFN – ta-ta for now
CYA – see ya (or it could also be: cover your a*s)
CUL8R – see you later
IMHO – in my humble opinion
IMNSHO – in my not so humble opinion
LOL – laughing out loud
ROTFL – rolling on the floor laughing
ROTFLMAO – rolling on the floor laughing my a*s off
RTM – read the manual
GG – good game
THX - thanks
TX - thanks
PLZ - please
ASL – age / sex / location?
IRL – in real life

S.E.X. Stash Enhancing Experience
AFAIC As Far As I'm Concerned
AFK Away From Keyboard
AIESATDA All I Ever See Are These Darn Acronyms
AISI As I See It
ANFAWFOS And Now For A Word Word From Our Sponsor
ASAP As Soon As Possible
AWGTHTGTTA Are We Going To Have To Go Through This Again
AYR As You Requested
AYRRRS Are you really Really REALLY Sure?
AYWWWS Are you weally Weally WEALLY Sure?
B4N Bye for Now
BAK Back At Keyboard
BCNU Be Seeing You
BRB Be Right Back
BTA But Then Again (in response to IOW)
BTW By the way
CCF Crippled Computer Fingers
CU See you
CUL8R See you later
DH Dear Husband
DYHSBTD Don't You Have Something Better To Do?
DW Dear Wife
EOM End Of Message
FISH First in, still here
FOAF Friend of A Friend
FOBL Fell outta bed laughing
FOCL Fell outta chair laughing
FWIW For What It's Worth
FYI For Your Information
GLGH Good Luck and Good Hunting
GMTA Great minds think alike
GR&D Grinning, Running, and Ducking
HIFOTFAIR Help! I've Fallen On The Floor And I'm Rolling!
HWMBO He Who Must Be Obeyed
IAE In Any Event
IMAO In My Arrogant Opinion
IMHO In My Humble Opinion
IMO In My Opinion
IOW In Other Words
IWBNI It Would Be Nice If
L8R Later
LOL Laughing Out Loud
LOLLOL Little Old Lady Laughing Out loud
LSHISOTS Laughing So Hard I Spit On The Screen
MOATYO Mind Of A 10-Year Old
NCATT NO Comment at This Time
NOTE Not Of This Earth
NPN Nine Patch News
NTTRN No Time To Reply Now
OIC Oh, I See
OTOH On The Other Hand
ROFL Rolling On the Floor Laughing
ROFFNPR Rolling On the Floor For No Particular Reason
RSN Real Soon Now
SO Significant Other
IO Insignificant Other
SWMBO She Who Must Be Obeyed
TAFN Thats All For Now
2F4W Too Funny For Words
TGIF Thank God Its Friday
or Toes Go In First (for blondes and Aggies)
TIA Thanks In Advance
TTFN Ta Ta For Now
WYGIWYPF What You Get Is What You Pay For
WYS Watch Your Step
WYSIWYG What You See Is What You Get
YDD Yabba Dabba Do