A monkey that lives in somebody's butt, or a very pesky person who you want to feed to a rabid Mako shark.
Stop being such a butt-monkey and help me clean this garage!
by Shawn B. May 22, 2003

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Someone who rides your ass like a horny spider monkey.
My boss is such a buttmonkey.
by Attila Ecsedy October 17, 2003

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A Character in a television show, manga, anime, comic book, webcomic, etc. who constantly gets abused and never gets ahead in life. Played for comedy.
Waspinator is a Butt Monkey! He even says 'Why universe hates Waspinator?!'
by SSM12 September 28, 2012

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Someone who pretty much idolizes another person, obnoxiously following/complimenting/laughing at their jokes which aren't even funny. Usually leaves this person disliked by others for being so damn weird.
Dan: Man, that guy who follows Jim around all the time is weird.

Phil: Who, Ken? Yeah he's Jim's buttmonkey.
by Urbanasia February 25, 2009

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Someone who has an invisible, permanent "Kick Me" sign taped to their back.
They're the butt of almost any demeaning joke, they commonly have horrible luck, and a large amount of horrible things happen to them. Their existence is just to solely have horrible things happen to them. If anything positive happens to them, the person usually gets screwed over in the end.
Charlie Brown from Peanuts is probably the best example for a "Butt Monkey".
Bill Dauterive from King Of The Hill.
by Sadow July 23, 2013

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someone acting in the way of an obnoxious rectile monkey friend.
n. That girl is such a buttmonkey.
by tyresha girl June 08, 2007

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One who is led astray very easily, and is gullible to the point of embarrassment.
"I have been used as bait THREE times, and I am no longer going to be anyone's butt monkey"
by Maximillion July 23, 2005

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The Urban Dictionary T-Shirt

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