A plastic cup. One places this cup in a urinal and proceeds to piss in it. Usually done with the homies in a big group.
I'm a lawyer. You pissed in the cup.
Les will have to clean up the piss cup.
Let's bring cups to the toilet so we can do the daily piss cup routine.
by George.McD May 3, 2019
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1: a cup that has had a rinse in urine to bring satisfaction when someone later drinks from the cup.

2: a cup/mug that has had urine in it for a while to make all future drinks have a pissy after taste.

3: a way of getting revenge on a boring man, namely naj.
man: oi naj drink this tea

naj: ta mate, nice tea, got a really sour after taste though.

man whispers to friend: he has no idea that hes drinking from a piss cup.
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