Getting so drunk that you are in alcohol induced coma. A BAC of over .755 is required in order to go BK. Going ham is the first step, getting black out is the second, then five steps later you go BK.
Guy 1: Yo I was going so ham last night it was crazy.
Guy 2: That's nothing, I went BK and passed out for 28 hours.
Guy 1: Damn homie....I wanna get BK'd tonight