Here's a few...
I'm not sure what you do, and don't know, so I'll throw out some:
BTW = by the way
NP = no problem
TY = thank you
LOL = laughing out loud
LMAO = laughing my a$$ off
ROTF = rolling on the floor
ROTFLMAO = rolling on the floor, laughing my a$$ off
STFU = shut the f___ up
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