Top Definition
Pronounced (Muh-Teesh-In), is a name given to people who ruin good jokes, either by adding stupid puns or running the joke on until it loses all meaning. Origin Unknown.
I told a perfectly good joke, and Jeff kept running with it until it wasn't funny anymore, he's such a matieszyn.
by IHeartPaint October 24, 2009

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The Urban Dictionary Mug

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