RBL's 

Roast Beef Lips. 1)Any chick whose labia(lips) either have a purple-brown tint to them, or hang more than two inches from their clit.
see also Meat Curtains.
2) Any-person who claims they don't know what I'm talking about is a RBL.

Avril Levine, Jenna Jameson, Carot-top

RBL's by Jpac August 9, 2003

Triple rbl's 

It is a triple threat pussy that is dripping wet with a rotten odor and has the long discusting flappy curtains.
Translation Runny, Rotten, Roast beef lips

Bro, that dirty skank had Triple Rbl's I didn't know what to do so I just pulled up my pants and ran for the door.

Triple rbl's by Matt Gilbert April 27, 2007