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1.
When a cigerette or joint is made wet by the mouth of the previous toker when passed around.

From the saying "as wet as a duck's arse", usually performed by inexperienced or intoxicated smokers.
Guy1: "There you go man."
Guy2: "Thanks."
...
Guy2: "Eurgh, dude. You've fucking duck arsed this thing."
by hyphon2k8 October 18, 2008