what some girls with a big ass have, especially when their shirt is too short and their pants are too tight

many men find this extremely attractive
damn did you see kristina's ass on christmas? it was flat but you could see under her shirt and there was like, this chasm. where did it come from?

yeah I know man, that was some serious ass cleavage! I wish I could meet her ass in person
by bill mesich January 17, 2007
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when the top part of a person's buttocks and ass crack is showing
person 1: Pull up your pants.
person 2: What?
person 1: Um, ass cleavage...
person 2: Noooooooo!
by proudfangirl February 8, 2006
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o.k.! ass cleavage is defined by how deep a girls ass crack is set within her gluteous muscles. in other words if you took a ruler and stuck it in between a girls ass muscles till it stops at her crack you would have an ass cleavage measurement. how deep a womans ass crack measurement yeilds, is what is known as ass cleavage! ass cleavage is a phrase normally utilized with girls who are very athletically built!
georgia peach, luscious lopez, sophie dee, mayara rodriguez, naomi, velicity von, gianna michaels, ricki white, destiny, sophie castello, candi summers, kristi lynn (God rest her soul), shanna mccullough, are all great examples of ass cleavage! all of these athletes possess exceptional ass cleavage characteristic of deep ass cracks!
by sleepy head t March 20, 2007
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massive gadunk adunk that resembles big bodacious tatas.
Shit yo! Look at Keith's ass cleavage! DAYAM! Dat shit can swallow a monkey!
by FupaTroopa July 15, 2003
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The act of a girl wearing a bikini bottom that is too small. So small to the point that her butt cheeks get pushed together and there is not enough material to cover the top of her butt thus creating ass cleavage.
by cali bred22 July 27, 2008
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Commonly expressed as the acronym: RAC

1) The visible outline of a girl's ass created when she wearing

leggings with either a long shirt or short dress/skirt that showcases the bottoms of her cheeks where they meet the back of her thighs. Resulting in upside-down cleavage of the ass best appreciated when she's walking up stairs.

2) Summertime variation would include the same get up sans leggings and/or with short-shorts.
Yo that girl Erica had quite the Reverse Ass Cleavage last night!
by gatsome January 27, 2011
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the top of your ass crack that usually reveals itself when you bend over.
i.e. builders bum
"dude, check out the chicks micklepock bum crack ass cleavage... i'd love to give it a lick."

"god damn i've got an itchy micklepock bum crack ass cleavage."

"woah!!! mate, pull up your trousers. your micklepock bum crack ass cleavage is giving me the stink eye"
by Lukris Aaromatt January 15, 2009
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