Top definition
Big Tits, Small Brain.

A girl with big breasts but doesn't have any smarts.
Justin: Yo, did you see that girl pass by? She got B.T.S.B!
Michael: Dude, THATS MY SISTER...
by Juuustin September 25, 2006
Get the mug
Get a B.T.S.B mug for your father Abdul.