Idiom Breakdown

shit in someone's Cheerios

HUMOROUSSLANGVULGAR

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Definition

Synonym of piss in someone's cornflakes.

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Origins

From the breakfast food Cheerios. The term comes from the notion that defecating in someone's Cheerios would ruin their day.

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In Context

"That woman shit in her husband's Cheerios when she divorced him on their anniversary."

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Also Said As

piss in someone's cornflakes