A term used to describe certain people with monkey-like features. Large ears, hairy arms and or knuckles, a vagin that hang like sleeve of wizard are all signs of a monkey fist. Often times they will also have short hair (if a female monkey fist), and they will also have a chronic armpit scratching disorder or CASD.
"I can't believe that Cory hangs out with John..."
"Yeah, but his sister hangs out with Monkey Fist, so that's even worse."