Normally used to mean "best friends forever", but occasionally used to mean "butt fucking fags" as a humorous double entendre.
1. "You're a great friend Sara. We're B.F.F.'s." (sincere)
2. "Look at those B.F.F.'s over there ... snicker." (second meaning)
2. "Look at those B.F.F.'s over there ... snicker." (second meaning)
by Lord Dickish August 02, 2006