To take something from your bro that he needs. Like his clothes, his food, his money, his computer.
Drew: Yo, stop busting off my laptop!
Anthony: I NEED to check my myspace, that cute girl sarah is online
Drew: I don't give a fucking fuck go bust off someone else's laptop!
Anthony: nigger...
Sexual act usually performed by two or more males where each participant attempts to insert the largest object into their anus. Size is typically judged by length though usages of average width and width at widest point have also been recorded.
Man that five hour long butt off was intense, I'm still shitting out styrofoam.