Top Definition
The monkey that, when you have drunk rather too much, breaks into your room while you're asleep, steals all your cash, punches you in the face and takes a shit in your mouth. Results in morning shit breath, no cash and a blinding headache.
Jesus...I feel like crap...I think I had a visit from the midnight monkey last night, I should never have drunk that last car bomb.
by SarniaDrew April 08, 2010
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