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
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The game of taking a laxative before performing intercourse and trying to ejaculate before the laxative hits
Jake: Ya me and jelly have been getting into it a lot she let me try a Black back mountain the other day
Rob: How’d it go?
Jake: Me and Kelly decided to take a break
by FlyersFan85 November 3, 2017
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Another description of a chick with a big ass.
Damn, gurl, you sure can shake it. You black in back!
by chriscapitolo May 1, 2008
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The act of preforming anal sex in the back of a car with a black man or woman, while the track, "Back in Black," by ACDC is playing through the stereo system.
Tom: Why couldn't you make it to Jordan's party?

Matt: Don't tell him, but I was giving his mom a Black in Back
by TheRealMickeyD March 6, 2012
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When one who is not of African descent has a buttocks that is larger than is generally scene in that persons ethnicity
Yo, that girl Jennifer, she's Chinese in the front but she's black in the back.
by DJ Sexual Predater July 25, 2009
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A term used to describe a girl (usually white) whose butt is extremely large and volumntuous.
Fergie is black from the back. (and the sides lol)

Taylor Swift is NOT black from the back.
by dontneed2kno November 24, 2010
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Following an action or the transfer of an object from one party to another, vocalizing, "black, black no trade back" prevents the receiving party from returning the action or object to its originator.
After giving Quin a paper ball, his father says, "black, black no trade back", leaving Quin stuck with the object. He must keep or dispose of the ball without returning it to his father.
by LapisLazuli January 13, 2014
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