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shit on (someone or something)
vulgar slang To harshly or excessively criticize someone or something. I know you're stressed about the wedding, but can you please stop shitting on me? I didn't intentionally bring the wrong box of decorations! If she's just going to shit on my ideas like that, then I don't see any reason to participate any longer.
Treat with malice or disrespect, as in I'm tired of all these administrators shitting on me every time I want to try something new . This usage is vulgar slang.