When one person defecates into their partners anus and they proceed to shit it back into the original members anus. This resembles a brown portal from the classic game, portal. This can go on for days, minutes, hours, really just as long as you keep shitting
Ben made sure to feast on Taco Bell at lunch night because he was going to attempt the Muddy Portal with his girlfriend tonight!
by Shippy69 November 27, 2019
when a man ejaculates in their parnters rectum and then performs oral to anal sex to reteive seamon and then passes that seamon onto their partner.
by steverenio October 05, 2007
When a man takes a shit, and then stands up and turns around to take a piss. He pisses on his own shit, making the water turn brown.
dooga: yo dawg after i let out that monster load, i decided to muddy the water
goodooga: yo man i did that last week!!
goodooga: yo man i did that last week!!
by Chrisoshayyy February 24, 2006
During anal sex, you pull out your cock, have the chick take a shit in your hands, rub it all over your dick and then put it in her pussy.
by Told_U_So January 30, 2009
The act of wiping the shit off one's anus onto the bottom of their nut sack with toilet paper after defecating.
by Broken Rubber April 27, 2014
A term used by pseudo-gay sexual predators(i.e. Bros) in reference to their victim's anus. Short for: muddy vagina.
by Hercules E. Rockafeller March 02, 2008
This girl who wears primary pastel primary color t-shirts told me she'd kill me if I broke up with her. I got a muddy lizard.
by Blackwater Brian July 04, 2012