Top definition
the moment in time when you are out so late that you "wake up" from being blackout drunk. often you will be confused about your surroundings and unaware what occurred in the last few hours.
"i blacked back in at 3am on the subway, and i had no idea what happened to my cake!"
by BlackBackInBoy August 18, 2011
Get the mug
Get a blacked back in mug for your buddy Jerry.