1.Acronym for "front butt fat fuck" referring a specific person.
2. Adjective. Someone fat, ugly, and has a toxic personality.
3. Also refers to someone with a toxic personality without having to be fat. It is a way of being.
(A front butt is when your stomach hangs down in such a way, it strongly resembles a butt on the front of your body)
"He may be The fbff, but she is a close second."
"Don't be a fbff."
"That was so fbff-like."