From Rap Dictionary
- To punch someone
- To kill someone. We pop, we brawl, get money till the day we fall -- RZA featuring Crooked I, E-40, Jayo Felony, King Tech, Lady Platinum, Method Man, Ol' Dirty Bastard, W.C (We Pop (Remix)) 
- When you have no money; Broke. "Nah, I'm pop."
Your dad or your "pops". Ex. "what up pop"
Or: Pop, Lock, and Drop it. Pop means to pop your body.