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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
Someone who rides your ass like a horny spider monkey.
My boss is such a buttmonkey.
by Attila Ecsedy October 17, 2003
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
someone acting in the way of an obnoxious rectile monkey friend.
n. That girl is such a buttmonkey.
by tyresha girl June 08, 2007
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
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
The monkey that lives inside you butthole. Many legends have been and rumors have been spread about the mysterious butt monkey and all of them are true. The butt monkey possess many powers including the ability to swing from dingleberries and smoke tons and tons of weed. He resides in everyone's butthole, but few know he's there because he only reveals himself twice a year, on St. Patrick's Day and September 23. Don't ask why he just does.
"Dude what the hell is a butt monkey?"
It's the monkey that lives in your butthole!!!!
by BigWood33 March 05, 2011