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!"
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!"