AFAIK As far as I know
AFK Away from keyboard
ASAP As soon as possible
ASL or A/S/L Age/Sex/Location
ATM At the moment
B Back
B4 Before
BBL Be back later
BBS Be back soon
BC Because
BG Big grin
BICBW But I could be wrong
BMG Be my guest
BRB Be right back
BTW By the way
CUL See you later
FWIW For what it’s worth
FYI For your information
GG Gotta Go
GL Good luck
GMTA Great minds think alike
GR8 Great
GRA Go right ahead
HAND Have a Nice Day
HT Hi there
HTH Hope this helps
IAC In any case
IC I see
IDK I don’t know
IIRC If I recall correctly
IM Instant message
IMHO In my humble opinion
IMO In my opinion
IMS I am sorry
IOW In other words
JIC Just in case
JK Just kidding
JTLYK Just to let you know
K Okay
L8R Later
LMAO Laughing my a** off
LOL Laughing out loud
MSG Message
NBD No big deal
NM Never Mind/Not Much
NP No problem
NW No way
OIC Oh I see
OMW Oh my gosh
OMW On my way
OTOH On the other hand
OTP On the phone
PLS or PLZ Please
POS Parent(s) over shoulder
QT Cutie
ROTFL Rolling on the floor laughing
SYS See you soon
SYL See you later
TAFN That’s all for now
TBH To be honest
THX or THNX Thanks
TIA Thanks in advance
TTYL Talk to you later
WB Welcome back
WFM Works for me
WK Week
WKD Weekend
WRK Work
WTF What the f***
WU? What’s up?
YT? You there?
YW You’re welcome