Top Definition
Another way of referring to someone's ass crack that's hanging out. Hence the "rear" in the term.

Same as saying "butt cleavage."
*guy walks by with his ass crack showing due to his pants being down too low*

Person 1: "Whoa, that guy's got some major rear cleavage there!"

Person 2: "I know. That's kinda... gross."
by Kikyo Maaka May 29, 2009
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