look up any word, like sex:
 
1.
When a girls pussy lips resemble that of roast beef. They r brown and loose.
Damn bitch u some fine R.B.S. (Roast Beef Syndrome)

Ewww I can smell that R.B.S. outside of your pants

Put that R.B.S right here.
by GuCcI May 19, 2013