An alternate name for a demon (or "pinky demon") in ID Software's original Doom game series.
Blood and viscera flew everywhere when I attacked the group of butt monsters with my chainsaw.
by Timotheus325 January 21, 2009
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An oversized 'butt plug'. See 'Butt Plug'
by MKULTRA July 7, 2013
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David: "Chris.......no matter what, you always seem to have sex with that chick in the butt."

Chris: "I know dude, that's why we call her the butt monster!
by jj887732 November 11, 2006
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A man with a buttcheek for a head and has no arms
Holy Crap It’s a Butt Cheek Monster Man
by Nijfhdksssjeked November 22, 2018
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Usually a girl who is obsessed with butt holes. Also could be a girl who farts often and loudly.
by VerySmartAndTruthful March 11, 2019
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