The term used to describe the act someone who works in a Lab testing peoples Faeces would engage in. Some more modern labs use little spades to transfer specimens, but this term is for the old fashion and hard core Labs.
by Jebusmoore November 4, 2007

An effeminate homosexual male bottom with poor anal hygiene who partially defecates during anal sex.
Lance is such a Muddy Mary. Every time I fuck his ass he whines like a school girl and stinks like an open asshole.
by Matt Whipple December 30, 2008

by johny T. cuddler December 11, 2004

by matt13 April 2, 2008

The act of smearing poop on one's pubic hairs, then proceeding to have anal sex with a girl where the poop gets rubbed on her ass.
by jimmy jibberish December 12, 2007

by punkscum August 19, 2013

*man walks in on his wife cheating on him*
Husband: CANT BELIEVE YOU DID THIS BITCH, YOU LET HIM MUDDY FUCK YOU DIDNT YOU?
Husband: CANT BELIEVE YOU DID THIS BITCH, YOU LET HIM MUDDY FUCK YOU DIDNT YOU?
by CreepinT9X May 27, 2009
