piss on someone or something
1.
in. to urinate on someone or something. (Usually objectionable.)
That dog pissed on my shoe!Hey, watch out! Don't piss on me!
2.
in. to degrade or denigrate someone or something. (Usually objectionable.)
He spent three paragraphs pissing on the play, then he said to go see it.He pissed on me, and then said I tried my best. What does that mean?