piss mud 

Mud created by mixing dirt and piss. Mainly formed by many people peeing outdoors in the same spot.

Hey Vance if you pee behind that tree look out for piss mud.

piss mud by Justin S February 7, 2005

mud piss 

When you're mid-piss and you start to crown a shit

Sorry I took so long, I was having a mud piss

mud piss by KW_Reggie June 27, 2019

piss mudhill 

A muddy hill that is the result of excessive urination by partygoers, found usually in large gatherings where restroom availability is at a premium such as parades, outdoor concerts, etc.

I walked down the path to more level ground to take a leak, in order to avoid the piss mudhill at all costs.

piss mudhill by TheGillenium May 5, 2018

Pissmud 

Pissmud is a soft slippery aggregate of trodden soil, grass and urine. Usually found around over flowing Porta-loos or chemical toilets at outdoor events such as music festivals.

"Dave slipped up by the porta-loo just as Metallica were coming on stage"

"Now he's got to watch the show covered in Pissmud"

Pissmud by erroneousapostrophe October 2, 2007