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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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