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.
by Fiddle me this June 16, 2022
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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.
by Mister Bad Example May 13, 2010
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Pissing in the sink instead of the toilet. An act which saves water and is therefore good for the planet but enrages women purely because they can't do it due to their defective chromosomes, causing them to make ridiculous claims such as "it's disgusting" when we all know that urine is sterile as it leaves the body.
"You better not be doing a sinkpiss again!"

"I pay the water bill bitch so until you let me put a urinal in the bathroom I'm sinkpissing!"
by Mr. Cardboard October 30, 2011
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