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1.
A Thousand Year Poop occurs when you think to yourself, "Golly, it feels like I haven't pooped in a thousand years!"

*And then you proceed to poop for a thousand years*
Jeffbro: Duderino Willies, I pooped so long the sky went from light to dark!

Dudewillis: Sounds like a Thousand Year Poop to me, Jeffrey Bruthers!
by Guymans February 04, 2013