To give someone an orgasm. Usually to a female. Not exclusive to only intercourse, but also orally or by any other means, depending on how tight your game is.
Break off..."I don't mind breakin her off cause she aint with the drama" -plies in shawty
To give or experience an orgasm quickly, powerfully, or even effectively. May be used by someone who is quite horny and just wants to get off. May also be used by someone who is tired of uneventful sex.
Woman: "Man, I just wanna break off some."
Man: "Aight!"