Acronym meaning "Cretins of the World, Unite." Though a custom started by mathematics teachers, it has become a commonplace phenomenon on the Internet through the efforts of amateur linguists. Usage is generally when someone has done something incredibly stupid.
User 1: "Everyone knows Clinton was a Republican."
User 2: "This definitely goes to CREOWUN."
by The Red-Hatted Plumber October 27, 2005

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