yo, i'm gunna b.t.f.o tonight  i failed that exam, i think i'm going to b.t.f.o to forget about it
this is an abbreviation of black the fuck out, not remembering what you will be doing that night
"yo, i'm gunna b.t.f.o tonight  i failed that exam, i think i'm going to b.t.f.o to forget about it" What is the definition of "b.t.f.o"?