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1. The act of putting your finger or fingers into someone's mouth while they are yawning, usually as a means of disrupting their yawn and robbing them of all satisfaction.

2. A vicious game that involves sticking your finger or fingers into people's mouths when they yawn.
"Oh shit! I just gave her a killer yawn stick!"

"Dammit, I just got yawn stuck!"

"Dammit, I told you, I don't play Yawn Stick!"
by Reusch April 14, 2008
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