pee in (someone's) Cheerios

rude slang To really upset, irritate, or disappoint someone. Sorry to pee in your Cheerios, but you won't get any credits for the class unless you attend every single lecture. A: "Watch out, the boss is in a foul mood today." B: "Wow, I wonder who peed in his Cheerios?"

Common Names:

Name	Pronounced	Usage
Anne (1)	AHN (French), AN (English), AN-ne (Danish), AHN-ne (Finnish), AH-nə (German), AHN-nə (Dutch)	French, English, Swedish, Norwegian, Danish, Finnish, German, Dutch, Basque
Phoebus	-	Greek Mythology (Latinized)
Amalia	ah-MAH-lee-ah (Dutch, German)	Spanish, Italian, Romanian, Dutch, German, Ancient Germanic (Latinized)
Eseoghene	-	Western African, Urhobo
Tameka	tə-MEE-kə	English
Tasgall	-	Scottish