Verb
(vulgar, slang, idiomatic) To show complete contempt for someone or something.
You just completely pissed on my job performance here.
(vulgar, slang, idiomatic, imperative) To reject (a person, an idea, etc.)
She wants us to work at night in the dark? Piss on that. I'm going home early.
You've done nothing but complain the whole time we've been here. Piss on you. I'm done listening to you.
Used other than figuratively or idiomatically: see piss, on.
Source: en.wiktionary.orgPiss on the world, or it'll piss on you. David Brin
Bonzo, he pre-cise. He so careful, he piss on a plate and never splash. Orson Scott Card
Ambition is not a dirty word. Piss on compromise. Go for the throat. Steven Erikson
To paraphrase Truman Capote, finishing a novel is like taking a child out behind the house and shooting it. To which I would hasten to add, that makes critics a bit like stranger who come along later to piss on the corpse. Caitlín R. Kiernan
Piss on etiquette,” Threpe said petulantly. "Etiquette is a set of rules people use so they can be rude to each other in public. Patrick Rothfuss
Got so much money, that dogs won't piss on my feet. Finnish Proverb