Top Definition
When two kids get mad at each other and start telling each other to shut up. There's also "you're gay" wars too.
Me: Look at them; they're having a shut up war. Heh.
Kid 1: Shut up!
Kid 2: No, you shut up!
Kid 1: No, you shut up!
Kid 2: No, you shut up!
by spel itt rite June 21, 2006

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