Karen: *does anything relatively retarded*
You and your bestie: *talking about how much you both hate her*
You: Karen is such a t.f.s.a.f.b I fucking hate her.
An acrostic term used to express the phrase, "Story Telling Followed By Laughter". S.T.F.B.L often takes place when a group of friends congregate and reminisce about past events in a stress free environment.
"Yo, Russell's story last night was so funny. That chill was such a S.T.F.B.L."