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The fear of seeing someone yawn in public, causing you to yawn, thus creating a chain reaction in your group of friends until they beat the living $*#! out of you for starting it.
Steve: "Dinner tonight? The usual spot."

Jimmy: " No man, I'd love to come to Quiznos, but I have serious Yawnophobia after what happened."

Steve: "Shit man, you should stay home, I'll kill you if you start that crap again like you did last week."
by jOnNy_LaPoInTe May 03, 2011
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