A person who's ass is so big, that it magically absorbs anything that you put in the crack, up to and including cookies, especially Keebler fudge stripe cookies. Anything put in the crack is never seen or heard from again.

or

A nickname for 1950's actor Stephen Zukowski. Also known as Num Nums Zukowski.
Hey, Num Num's ass crack is showing
Let's put a Keebler fudge stripe cookie in there.
Oh my God!! The adventures of cookie butt lives!!!!
by sillyrascal August 22, 2010

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Top Definition
the feeling you get after you take a shit where it seems like no matter how many times you wipe it feels like there are still poo particles around your ass.
"Man that was a messy shit. it gave me a bad case of cookie butt"
by NOFXisthebest87 August 01, 2008

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a young cute girl that has a tight vagina
damn u see that cookie butt i'll eat that shit with a spoon
by nickle stack and ed dirt September 20, 2007

The Urban Dictionary Mug

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt