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The blueish layer of mold that forms on a loaf of sour dough bread after it has been left in the back of one's cupboard for a minimum of 5 months.
1. Johnny: I tried making my dad a sandwhich, but he threw a fork at me, because it had sduzin on it. What a table nazi

2. Tom Wysocki: Mmm, sour dough.
Mike: dude that shit has sduzin on it.
by macdaddy O September 01, 2006
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