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1.
a deliberately dumb or dull insult, used when replying to someone who said or wrote something stupid or insipid
Did you read what she wrote in her blog?
Yeah, I sent her a dult.
by SirMatelot November 19, 2009
 
2.
a replacement word; it can be used in lieu of any curse or offensive word
"What the dult?"
"Suck my dult."
by te's friend June 01, 2004