ASAP
as soon as possible
BRB
be right back
BTW
by the way
SRSLY
Seriously
JK
just kidding
DM
direct message
QQ
crying
IDK
I don't know
TBH
to be honest
lmk
Let me Know
g2g
got to go
IDC
I don't care
AFK
away from the keyboard
FYI
for your information
TTYL
Talk to you later
TL;DR
To long, didn't read.
HIFW
how I feel when
IRL
In real life
LOL
laughing out loud