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1 definition by LisaD143

 
1.
A man that is developing a bald spot on the back of his head resembling a baboon’s or chimpanzee’s ass. This phrase works best if the person combs his hair over this balding area and thinks nobody notices he trying to hide it!
Check out the "monkey butt" on that guy or "nice monkey butt".
by LisaD143 August 02, 2005