dun a.k.a. thun 

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.

"...you 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!"

dun a.k.a. thun by F.A. Rich a.k.a. MC Krewga April 7, 2004

Dun Kno 

Jamaican patios; slang meaning "of course" or "I know"

Q: Yo, you comin' to tha party tonight

A: Yea man, u dun kno!

Dun Kno by Angelene April 22, 2008

Dun Kno 

forsure, agreein wit sumtin.

"dun kno C'sz UP"

"dem bloodsz are bitchesz".."dun kno"

Dun Kno by LocMamii April 26, 2006

Ya dun know 

Just a generally way of biggin sumin up or agreein wit sumin

rudeboy1:You know that Jezabel Laura
rudeboy2:yeh
rudeboy1: shes a sket.
rudeboy2: ya dun know!

Ya dun know by thisaintrealymyname March 6, 2009

dun'knoe

to agree with or back up someone

terry: got that girl is hot
jimmy: you dun'knoe man

dun'knoe by jw15 August 23, 2011

YOU DUN KNOW 

YOU DUN KNOW is basically a sayin used by pure badmen, rudeboiz, rudegaldem, and all the mandems locked on inside. it means YOU DUN KNOW you wud use this sayin in sad or scary times when mans got his back against the wall and the gunchester/bombingham mandems are comin at him with baaare machete bled ya get me? Its hard to explain so just read the examples bit yeah while i cut off my foreskin yeah U DUN KNOW its gunna hurt yeah

geekman/wasteman - "hold tite the beef n ting"

rudeboi/man with 4skin - "yeah blad you dun know da myspace dot com yeah forward slash beng beng yeah hold tite skepta jme you dun no blad"

geekman/wasteman - yeah man blat blat u dun know the facebook and the faceparty thing fam ya get me?"

rudeboi/man with 4skin - "oi shhut ya mouth waaasteman durkhead YOU DUN KNOW facebook is for fassys and man with no 4skin big up the gears of war mandem yeah one love one life lets get together and feel my right............... testicle ya dun no fam im lyrically sick yeah 1 love breh"

YOU DUN KNOW by waqar sadeeq February 6, 2008

Dun know bout dat 'ting 

When someone says something right or justified, this is the above response.
Or, it can be used as an agreement when someone states something.

Alie... dun know bout dat 'ting!

Dun know bout dat 'ting by A dot Gee May 29, 2010