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
Get the mug
Get a Rear cleavage mug for your barber Trump.