Top Definition
when between your ass cheeks gets sweaty and my begin chaffing and causes discomfort.
hey i got some real bad monkey bum right now.
by extremeknowledge April 27, 2011
A cheeky but affectionate pet name for a boy / girl friend to call one another by.
"I Love You Monkeybum"
by Jake Mortimer May 16, 2007

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