n. Mythical Simian like creature that magicly appears during the middle of the night to Ruffle your hair, shit in your mouth and nick $50 out of your wallet while you sleep. Often visits after you duck out on a Friday night for a few "bevvies" with the boys.
And I'd just nipped out for a few quiet beers with boys and the next thing you know I wake up with a hangover and the "BeerMonkey's" paid me a visit!