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3.
The two fleshy sides of the buttocks
Marcel marveled at the way her asscheeks sprang back when he squeezed them.
He grasped her asscheeks on the sides and directed his cock at her shining slit.
by Tiago Zuhr September 24, 2005
 
1.
Used as an adjective to describe something that is frustrating or ridiculous. Used in the same way as "bullshit."

Can also be used as a noun. See the cheeks.
I can't believe I missed the final exam. That's asscheeks, man.

The IR spectroscopy is not showing the correct structure, which is totally asscheeks.
by Hereta July 07, 2009
 
2.
Also known as butt cheek or gluteus maximus to some, an ass cheek is just a way to refer to the cheeks of your ass while getting to say ass.
That shit was so big that it hurt my ass cheeks on the way out.
by Jake March 05, 2005
 
4.
A term used to describe a complete clutz. Someone who has the ability to knock things over regularly, and/or messes things up at an untimely point.
1)*spills drink over table* "Awwwww dude, you're a fucking asscheek"

2)*trips over table smashing a vase* "Look what you've done now you complete asscheek"

by Boooooollocks October 02, 2005
 
5.
The round flesh sitting at the very top of your thighs and under your back. It is almost like a cover for the anushole. Often slapped, grabbed and targeted by horny people. If left unwashed, they can grow nasty pimples.
There must be a tight ass and twat obscured beneath those big golden asscheeks.
by Wasabimoto December 14, 2007