piss in someone's cornflakes

• pee in someone's cornflakes, pee on someone's cornflakes

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piss in someone's cornflakes (third-person singular simple present pisses in someone's cornflakes, present participle pissing in someone's cornflakes, simple past and past participle pissed in someone's cornflakes)

1. (idiomatic, vulgar, informal) To disappoint or irritate someone.

   Synonyms: see Thesaurus:put a damper on

   Sorry to piss in your cornflakes, but my mom's got asthma, so take your cigarettes outside.

   • 2018 November 17, “Food Hunt”, in Angry Birds on the Run‎, season 1, episode 2, spoken by Bomb (Baker Terry):

     Okay, now I don't want to pee on your cornflakes or nothing, but how exactly are we going to get up there?