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1.
Of Arab origin, a Bum Monkey is a small, Anal-dwelling monkey that makes a habitat out of the rectal passage. It feeds off lumpy faeces and looks like a rodent.
Karim is a Bum Monkey in Fahd's ass!
by Maverick Corleone May 28, 2006
 
2.
an male who tends to hang around the anal orifice of other men
dude that guy checking you out is a bum monkey
by captainspanker October 31, 2008