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4.
A Piss Jug is a receptacle of variable size, optimally made of a water-proof substance, into which urine may be expelled directly from the body. Piss jugs are generally used in situations where a conventional toilet is unavailable.
Cedric couldn't hold it any longer: he'd had seven large glasses of beer, and the line-up for the washroom was just too long. He grabbed an empty pitcher from the table, disappeared into the walk-in cloakroom, and emerged about a minute later with the Piss Jug nearly half-full.
by Hieronymus March 31, 2008
 
1.
Simply put, a piss jug is any large vessel that houses ones urine for safe transportation to a landfill site.
Rays piss jugs ended up congesting up one entire end of the sunnydale dump..........
by Richie June 06, 2006
 
2.
A Piss Jug refers to a receptacle of varying size, optimally made of a water-proof substance, into which urine may be expelled directly from the penis. Piss Jugs are generally used in situations where a conventional toilet is unavailable.
Cedric couldn't hold it any longer: he'd had seven large glasses of beer, and the line-up for the washroom was just too long. He grabbed an empty pitcher from the table, disappeared into the walk-in cloakroom, and emerged about a minute later with the piss jug nearly half-full.
by Hieronymus March 29, 2008
 
3.
Truckers (People who drive trucks) have a schedule to follow. So in some rare cases, instead of stopping at a truckstop to take a pee, they pee into a container or bottle of some sort, and toss it out onto the side of the highway.

This is probably fake, and if so has its origin from the TV-Series "Trailer Park Boys", and is first mentioned in Season 6, Episode 01, "The Way Of The Road".

So basically, pissjugs is something you don't want to find on your front lawn.
"There's pissjugs lying all over the place!"
"Can you get these fucking pissjugs out of here?"
by Myschly May 01, 2006