look up any word, like columbusing:
 
1.
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
 
2.
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
 
3.
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