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The sudden overthrow of a government by a large group of cows. A troublesome issue in places like Wisconsin, where there are more cows than humans.
Farmer 1: What are all those cows doing running towards us like that?

Farmer 2: Oh my god! It's a moo d'etat!

Arnold Schwarzenegger: Get to the chopper!
by Devin"The Balls"McDermott January 08, 2006
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