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...
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.