AFAIK = As Far As I Know
AFK = Away From Keyboard
ADN = Any Day Now
ASAP = As soon as possible
BAK = Back At Keyboard
B4N = Bye For Now
BBL = Be Back Later
BBS = Bulletin Board System or Be Back Soon
BEG = Big Evil Grin
BG = Big Grin
BHOPW = Banging Head On Padded Walls
BIL = Brother In Law
BRB = Be Right Back
BTW = By The Way
BWL = Bursting With Laughter
CSG = chuckle, snicker, grin
CSS = can't stop smiling
CU = See You
CUL = See You Later
CYA = see ya!
C&G = chuckle and grin
DH = Darn/Dear Husband
EG = evil grin
FAQ = Frequently Asked Question
FWIW = For What It's Worth
FYI = For Your Information
GAL = Get A Life
GD&R = Grinning, Ducking, and Running
GMTA = Great Minds Think Alike
HMP = Help Me Please
HHIS = Hanging Head in Shame
HTH = Hope this helps
ILY = I love you
IMO = In My Opinion
IMHO = In My Humble/Honest Opinion
IMNSHO = In My Not So Humble Opinion
IYKWIM = If You Know What I Mean
IRL = In Real Life
IOW = In Other Words
J/K = Just Kidding
JMO = Just My Opinion

JMV=Just My View

JTLYK = Just To Let You Know
LHO = Laughing head off
L8R = Later
LMK = Let Me Know
LOL = Laughing Out Loud
MIL = Mother In law
N2S = Needless 2 Say
OIC = Oh I See
OTTOMH = Off The Top Of My Head
PDQ = Pretty Darn Quick
PITA = Pain In The "backside"
PU = That Stinks!
ROFL = Rolling On Floor Laughing
ROTF = Rolling On The Floor
ROTFLMHO = Rolling On The Floor Laughing My Head Off
ROFLMAO = Rolling On The Floor Laughing My "backside" Off
SAHD = Stay At Home Dad
SAHM = Stay At Home Mom
SIL = Sister In Law
SO = Significant Other
TAFN = That's All For Now
TBDL = To Be Discussed Later
TFTT = thanks for the tip!
TGIF = Thank God It's Friday
TTFN = Ta-Ta For Now!
VBG = very big grin
WAHM = Work At Home Mom
WAHD = Work At Home Dad
WB = Welcome Back
WFM = Works For Me
WTG = Way To Go
YO = Years Old (as in 3yo)
YK = You Know?
YKWIM = you know what I mean?

Just a few more........

B'cuz or B/C= Because
MYOB=Mind your own business
NOYB=None of your business
NT=neuro-typical (nobody is "normal" anymore)
LOL=Laughing out Loud
<WG>Wide Grin
;o) =wink