look up any word, like the eiffel tower:
Cock suckin-but fucker
He's a CSBF!
Man...what a CSBF!
I bet hes a big CSBF!
by "Jim" September 19, 2005
Casual Sex Between Friends
Kim and I were friends since childhood. We never thought CSBF was wrong, since we were both OK with it.
by Andy Jenicek January 19, 2006