porcelain piss 

When you get up in the middle of the night to go to bathroom, you urinate on the porcelain inside the toilet, instead of directly on the water to avoid making that 'sploshing sound.' This is done to avoid waking up your spouse or a roommate.

"I heard you get up last night and go to the bathroom"

"Really? Thats strange, I took a porcelain piss."

porcelain piss by thelol6 December 26, 2010

piss on the porcelain

An expression that implies one is being overly subtle while doing something common - such as talking. Similar to the way one would urinate on the bowl of a toilet or urinal to avoid creating an audible noise.

I want to call my boss an asshole, but I can't. I'll just piss on the porcelain about it for self-satisfaction.

piss on the porcelain by Big Dick Chuck November 7, 2007

Pissing like you hate porcelain

The act of urinating so forcefully that anyone in earshot is convinced you have a hatred of toilets/urinals.

I held it for so long that when I finally went, the guy next to me said "you were pissing like you hate porcelain."

Pissing like you hate porcelain by THVVW October 6, 2011