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When somebody fucks someone else in the ass and cums inside their asshole. Then, the one who took it in the ass squeezes the cum out of their ass. This makes it appear as though their shit is white, which is the color of a pigeon's shit.
Yo, I just buttfucked some girl and then I saw her pigeon-shitting on my blanket. She's fucking gross.

You know how I know you're gay? Because you've been caught pigeon-shitting in a guy's mouth.
by Chunky MoFo July 10, 2008
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