RBM

It Means "Rebecca Black Moment"
Basically used when someone states the obvious.

Girl: Yesterday was Thursday so..today is Friday
Guy: You just had a RBM

by ShaniceNicole April 24, 2011

RBM

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!

by APeezy716 December 17, 2008