piss in someone's Cheerios
Ruin someone's morning
To piss in someone's Cheerios is to ruin their mood or spoil something they were enjoying, especially by being unnecessarily negative or critical.
The image is of someone contaminating your breakfast—a petty act of sabotage that ruins an otherwise pleasant start: Who pissed in your Cheerios this morning?
The phrase often appears as a question directed at someone acting irritable or hostile for no apparent reason.
- antagonizeIncite hostility in
- spoilDamage or overindulge
- provokeIncite a response
- interfereObstruct or meddle uninvited
- offendCause hurt feelings
ruin · criticize · vex · rub the wrong way · sabotage · undermine · alienate · upset the apple cart · throw a wrench in · derail · wet blanket · buzzkill · insult · disrupt · mess up · upset · thwart · aggravate
piss in someone's Cheeriosmake someone's day
Cause great pleasure
warm someone's heart · lift someone's spirits · bring joy · sweeten the deal · delight
piss in someone's Cheeriosbutter someone up