Tbh-To be honest
Fyi- For your information
ttyl- talk to you later
ttys-talk to you soon.
ttyvs- Talk to you very soon
LOL- Laugh out loud
btw-by the way
DSGHQ-Damen Spike Gaming Headquarters
ily-I love you
ilysm-ilysm
nvm-nevermind
OMG-oh my god/gosh
OML-oh my lord
KMS-kill myself. (I do not want to do this.)

(Anymore to add?)

There are 1.1 Billion more! Lmao < that's one

kys - kill yourself
smh - shaking my head
dw - don't worry, doctor who, dark warriors, d.w from arthur
lmao - laughing my ass off, but when I say lmao I literally just mean lmao
brb - be right back (usually means i'll be back in three hours)
afk - away from keyboard

Well everything has an abbreviation nowadays. Soon OldCP will just be addressed as "O".

Or "WEHAAN.SOWJBEAAO." for short.

ilysm - ilysm ????

it means i love you so much.
also heres some more I have used for my internet life (i dont have an internet life.. i dont even have a life ughh)

aka - as known as
brb - be right back
gtg - got to go
afk - away from keyboard
idk - i dont know
idc - i dont care
gr8 - great
irl - in real life
asap - as soon as possible