A person that exceeds idiotness. Someone that thinks you're oblivious and stupid when they are actually dumb as a box of rocks that have been stuck in a blender then tossed in the toilet then took out then incenerated.
Gosh, Dylans a crack monkey. He likes to grunt and moan at random times then criticises you for telling him to shut up.
A crack monkey is a person you see at a sleazy bar, or just walking in the bad part of town who's addicted to crack. You can always tell them by their call -- "Hey man, do you think you could spare a dollar?". By definition, a crack monkey should be of african-american descent, but sometimes this can be overlooked.
That damned crack monkey asked if he could borrowthree dollars to he could get on the city bus.