piss in your cheerios

When somebody fucking ruins your day that was going well.

Hey man I don't mean to "piss in your Cheerios" but I saw your lady blowing some guy in the parking lot at bar close last night.

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pissed into your cheerios

When somebody is in a really bad mood, somebody might have urinated into his bowl of cereal earlier.

Person 1: *rant*
Person 2: Hey, who pissed into your cheerios this morning?

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pissed in your cheerios

To give somebody bad news.

"Sorry to have pissed in your Cheerios, but that chick that just gave you a blowjob has an Adam's apple and a hard-on."

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