a prolapsed arse, resembling that of a baboons arse or any other of those wonderful red arsed primates we descend from.
After removing the bulbous 12" butt plug she had a very impressive case of monkey butt.
by AaronMF October 4, 2005
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Teenage girls gather up/bunch up thier shirts in the back and secure the shirt's ponytail with a rubber band or the like.
When we were at the mall we passed a group of girls all sporting monkey butts.
by MichiganNorth Country November 26, 2008
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The butt of a monkey.

A word that ascribes the characteristics of the butt of a monkey to a person.

What you tell someone when they term 'whanker' just doesn't seem to apply.
Dude, you whanker!!! Wait, that ain't right, you're not a whanker at all... You're a MONKEY BUTT whanker!!!
by General Cluck-Cluck June 8, 2003
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Term used by a girls boyfriend whom usually loves her dearly to describe her / pet name when he is being playful.
Zygmont called his girlfriend a monkey butt when they were joking outside the classroom
by obbie connobie February 15, 2007
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The geasy spulge left in your ass after shitting, if not wiped properly. It can sometimes occur even after a thorough wiping because occasionally your rectum may seep. Warm and humid weather may also intensify this harsh reality.
After taking a growler, I realized i had a bad case of monkey butt on the par three 5th. There was no outhouse around!
by pis2114 May 27, 2006
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When your ass gets all sweaty and chaffed from recieving too much anal sex.
Best when a banana is used and the act is performed in your brand new kitchen.
Jeff Misner has the nastiest monkey butt i've ever seen.
by Jennie August 2, 2004
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a clapping of the hands together to resemble a monkeys butt
by matt January 21, 2005
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