B.O.B. stands for Blacked Out Bitch, a person (can be male/female) that is blacked out (i.e. cannot remember what happened to them due to drinking too much alcohol)
Boy 1: Why can't I remember anything last night?
Boy 2: Because you were a B.O.B! You drank way too much 4 loko.
Boy 2: Because you were a B.O.B! You drank way too much 4 loko.
by megsies3456 December 10, 2010