Phrase used when expressing shock or confusion, as if saying "you're lying!" or "you can't be serious" or "i don't believe you!" in a positive way.
A: "i just got engaged!"
B: "stop! you're taking a piss!"

or

A: "i just got robbed"
B:"you're taking a damn piss, when did this happen??"
by Ru_ox May 14, 2023
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