piss in someone's cornflakes

idiomatic informal vulgar

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

Japanese Meaning

誰かをがっかりさせたり、苛立たせたりすること。 / 他人の気分や期待を損ねる行為。

I hate to piss in someone's cornflakes, but their report contains numerous factual errors.

人の楽しみを台無しにしたくはないが、彼らの報告書には多くの事実誤認がある。

Sense（1）

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

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

pisses in someone's cornflakes

（ present singular third-person ）

pissing in someone's cornflakes

（ participle present ）

pissed in someone's cornflakes

（ participle past ）

pissed in someone's cornflakes

（ past ）