Random Black Man; usually found in parties around college campuses. Can often be found dancing shirtless near the stereo after only a few drinks. Nobody at the party knows this man, making his blackish presence random.
Partier 1: Dude, who's that shirtless nig dancing near the stereo?
Partier 2: I don't know, looks likes an RBM to me.
Partier 1: Quick, hide the Hennessey!