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1. Black in Back
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
2. black in back
Another description of a chick with a big ass.
Damn, gurl, you sure can shake it. You black in back!
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