DUH its poop coming from a bum bumbooty and having diarhhea, but when u say face, it means the person u said it to looks like poopy bum bum booty having diarheea
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.