When a guy sticks his dick in an ass, takes it out and slaps the other person in the face, imitating a windmill
Steven: "MAN!! last night I gave a girl an extremely excellent muddy windmill... she loved it!"
Jack: "Sounds like fun! We should try it sometime"
Jack: "Sounds like fun! We should try it sometime"
by JuneauPankake February 6, 2010

A process more "intimate" than the glass bottom boat. It involves releasing ones bodily waste through the anus on to the eye glasses of a loving admirer.
While Melissa was hitting the bong, I squatted quietly over Cory and gave him a close up of my Mexican dinner from last night.
While Melissa was hitting the bong, I squatted quietly over Cory and gave him a close up of my Mexican dinner from last night.
While Melissa was hitting the bong, I squatted quietly over Cory and gave him a close up of my Mexican dinner from last night. He loves it when I give him muddy windows. I'm Lee.
by Box May 6, 2004

by matt13 April 2, 2008

When you fuck a girl in the ass so balls deep, that her shit gets all over your scrotum. You don't notice the wet shit on your sack until you look down. It's quite shocking.
Unlucky Dude: What the quack, Kacie? Your mud is all over my hairy ballsack!
Kacie: It's your own damn fault for penetrating my asshole so gosh darn deep!
Unlucky Dude: Well now I have a Muddy Duckskin...thanks a lot!!!!
Kacie: It's your own damn fault for penetrating my asshole so gosh darn deep!
Unlucky Dude: Well now I have a Muddy Duckskin...thanks a lot!!!!
by Perv Tycoon February 3, 2014

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
