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1.
verb: pretending to be ignorant, to not know the answer; usually to avoid having to answer more questions.

The teacher asked a student to state one of the rights listed in the First Amendment.

"I don't know any," said the student.

"He's duncin her," whispered his friend. "He knows them all!"
by lightrayrider March 13, 2009
 
2.
Noun - To describe, or be described, as an idiot stupid enough to date mormans. Usually a decendant of story telling Canadians. Always in a miserable mood.
"Man that Pre, he's so fast and duncin!"
by Laub May 21, 2006