Top Definition
Originated by the Infamous Mobb Deep, this slang term came about when Havoc(who has a speech impediment) couldn't pronounce "son" correctly, thus "thun" or "dun". Today, dun is commonly used in casual conversation quite flexibly. With a variety of meanings in various contexts, dun still translates as son among urban cultures. It is often used loosely as a reference to a person.
" better finish what you started dun."-Mobb Deep

"Yo, wassup dun? I heard them cats was runnin 13th and Prospect."

"I heard Marie just gave birth to your baby dun!"
by F.A. Rich a.k.a. MC Krewga April 07, 2004
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