To fall asleep inadvertently, especially when one intends to do something else (such as to work or study).
I would have been finished with the essay due for my English paper, but I blacked out at 7:30 (PM) and just woke up (it's 11:30 PM). I guess I'll have to pull an all-nighter. I hope I don't black out again this evening.
By an elite
when it is dark
it urened the lights off and there was a black out
By Anonymous
To become enraged, and to express the rage by shouting and screaming, but using no physical actions. If you Black someone out, it is similar to cussing out. Derives from the screaming comedian Lewis Black
Phil: Dude what happened to that guy? Joe: I don't know, someone told him he was being a jerk and then he just had a Black Out
By slim phil321