LOL
Laugh Out Loud

BRB
Be Right Back

TTYL
Talk To You Later

BTW
By The Way

IDK
I Don't Know

IMHO
In My Humble Opinion

OMG
Oh My God

FYI
For Your Information

TBH
To Be Honest

ASAP
As Soon As Possible

IRL
In Real Life

SMH
Shaking My Head

NP
No Problem

IDC
I Don’t Care

JK
Just Kidding

BFF
Best Friends Forever

NVM
Never Mind

AFK
Away From Keyboard

YOLO
You Only Live Once

GG
Good Game (often used in gaming contexts)