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)
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Making fun of someone or something, or kidding with someone about something.
You really won the lottery?
Naw, I'm just taking the piss.
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Motivate someone by insulting them.
I piss someone on today so bad by calling him a "lazy loser" that he actually went out to look for a job.
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