"Taking the piss is a Commonwealth colloquial term meaning to mock at the expense of others, or to be joking, without the element of offense. (Compare with the American "fữḉk with.") It is a shortening of the idiom 'taking the piss out of', which is an expression meaning to mock, tease, joke, ridicule, or scoff.
"It is not to be confused with "taking a piss", which refers to the act of urinating.
"Taking the Mickey (Mickey Bliss, Cockney rhyming slang), taking the Mick, or taking the Michael are additional terms for making fun of someone. These terms are most often used in the United Kingdom, Ireland, South Africa, New Zealand, and Australia.
I'm currently reading a British mystery novel where pissed is used to mean drunk. In the U.S., I would say it's most commonly used to indicate anger, i.e. I was pissed off about the recent Supreme Court decisions.
They didn't start the fire, it was only burning since the world started turning. Peeing on it isn't doing much. You're able to piss in the wind as well.