# piss in someone's cornflakes

idiom · Vulgar

Source: https://englishreference.com/idiom/piss-in-someones-cornflakes
Updated: 2026-08-10

## Meaning

To disappoint or irritate someone.

## Examples

- Don't piss in my cornflakes by canceling our plans now.
- I was excited about the promotion, but my manager really pissed in my cornflakes by changing the requirements at the last minute.
- While the team celebrated their hard-won victory, the critic’s harsh review arrived to piss in their cornflakes and dampen the collective mood.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.