Monkey bum face 

Similar to 'Monkey Face', when a male shaves his genitals, ejaculates onto his partners face and throws his pubic hair onto the woman's/man's face. However when partaking in a 'Monkey Bum Face', the male shaves the hair from his bum instead of his genitals.

When finished shout "Monkey Bum Face" whilst doing jazz hands.

Monkey bum face by The_Morganator August 10, 2009

monkeybumface 

cute euphamism for an ugly girl, probably your girlfriend.

"coochy-coochy-coo!
Are you my little monkeybumface?
Yes you are!"

monkeybumface by barry Smith May 15, 2006