Top Definition
A Piss Jar is mostly known as any type of jar you take a piss in then slide under your bed because you don't feel like getting up to go to the bathroom at night. They can also be used while driving, then tossed out the window.
"I forgot to empty my piss jar this morning and my wife spilt it while she was sweeping beneath the bed".
by Jump The Shark November 24, 2011

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