Top Definition
Anal sex, or back door entry.
"Man, I was knockin poop all night with that slut, Nick. He answered his back door with some shit that got all over my dick"

"Did you guys get the poop knock on last night?"
by Aaron and Jacob March 15, 2008

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

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