A monkey that has been dwelling inside of the cheeks of the ass
A guy who is very hairy and typically likes to fart. He sometimes even throws his shit at you for fun. This is a great insult if you are mad at a particular someone.
when you're surprised
'holy ass monkeys you scared me!!!'
Person 1- ohhhh that ass monkey
Person 2 - omg your so awesome how did you think of that name
Person 1- I don't know I just pulled it out of my ass
To be an ass monkey is to be or act totally stupid. This includes people who are total idiots.
Hilbert: Nate's such an ass monkey.
Hilda: I know right?