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Stems from the name of, and is synonymous with "The Watcher." An Uatu is any person who observes a sexual act, and 'hides' somewhere in the room and masterbates. The presence of an Uatu may or may not be known to those participating in the sexual act.
Kyle always gets stuck being Uatu when he and his friends perform a Dirty Girard.
by langstonJR December 15, 2010
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