Sidepisser 

A moron, who, at a urinal,pisses toward the side, thus is likely to piss on a) his leg or worse b) pissing on your leg.

"Dude your pantsleg is all wet."
"Yeah I was beside Irvin in the bathroom."

"Yeah he's a fuckin sidepisser."

Piss, urinate, pee

Sidepisser by catcherholic July 21, 2016

Sinkpisser 

A Sinkpisser
(Also referred to as an 'outside the box thinker')

is a man who's distinguished by his bold decision making ability under pressure.

Where one man see's a bathroom full of taken stalls and empty sinks,
Joseph a veteran sinkpisser saw opportunity.

Sinkpisser by Fiddle me this June 16, 2022

Sinkpisser 

One who is boorish, thoughtless, unsophisticated and ill-mannered. So ill-mannered, in fact, that they lack the courtesy to wait for an available urinal or commode, and instead elect to micturate in the fucking sink.

Christ, who invited that sinkpisser to the party? Last time he came here, he ate all the buffalo wings and wiped his hands on the curtains, right after he put his cigarette out on the cat.

Sinkpisser by Mister Bad Example May 13, 2010

Sitpisser 

A guy who likes to sit down when they pee rather than standing up.

Cheef is such a sitpisser.

Sitpisser by TeamHellYeah March 16, 2019

sitzpisser 

German Slang for someone who pees sitting not standing.

Joe ist so ein Sitzpisser.

sitzpisser by Big Fab November 1, 2021