shit in someone's Cheerios

慣用表現俗語卑語

(slang, vulgar, idiomatic) To ruin one's day.

日本語の意味

（俗語、下品な表現）誰かの一日を台無しにする / 誰かの気分や調子を壊す

I didn't mean to shit in someone's Cheerios by pointing out the mistake, but I had to say something.

間違いを指摘して相手の気分を台無しにするつもりはなかったが、言わなければならなかった。

意味（1）

(slang, vulgar, idiomatic) To ruin one's day.

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

shits in someone's Cheerios

（ present singular third-person ）

shitting in someone's Cheerios

（ participle present ）

shit in someone's Cheerios

（ participle past ）

shit in someone's Cheerios

（ past ）

shitted in someone's Cheerios

（ participle past ）

shitted in someone's Cheerios

（ past ）

shat in someone's Cheerios

（ participle past ）

shat in someone's Cheerios

（ past ）