Top Definition
A stain left on a glass surface after a particularly dirty bird, usually a pigeon, has flown into it. Tends to look like an angel or, in rare cases, the rabbit from Donnie Darko.

"Dammit dude, a bird just flew into my window. I hope there's no pigeon stamp, third story windows are a pain in the ass to clean."
by Flyingwaterbottles April 04, 2010

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