to let the air out of their balloon, to mock/make fun of them. Customarily, shortened to just take the piss.
From the movie Snatch:

"take the piss out of someone" is abbreviated to "take the piss"

Boris the Blade: (mutters vague insults at Tony)

Bullet Tooth Tony: Don't take the piss (i.e., out of me), Boris!

Boris: Fuck you!

Tony: (empties the magazine of his Desert Eagle .50 into Boris)
by Roberto y Maria August 19, 2011
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I piss someone on today so bad by calling him a "lazy loser" that he actually went out to look for a job.
by powerphillg5 July 16, 2017
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a way to show your respect (or disrespect)
OH NO! i broke the thermometer so i`m gonna piss on your balcony. i hope your brother isn`t around!!
//oops i pissed on someone`s balcony a few years ago.
//oops i piss on someone`s balcony
//oops
//oooops
//ooops
by idealanakvartala January 23, 2022
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