Dump is a NY slang, used in the Bronx, NYC and Hralem. It's used by gangsters/rappers that are from the hood. They refer to killing somebody by "dumping the clip", it means emptying the clip. Basically, dumping (on) someone means killing them in different ways, usually with a gun.
Bunny Hop is a song/dance made by popular NYC Drill rapper, DThang Gz. The Bunny Hop is making fun of an "opp" that started hopping (like a bunny) after getting shot.