Dun simply means "son". Originally started from a handicaped kid in Queens, NY. He couldn't pronounce son, so everytime he said son, it sounded more like dun. Mobb Deep coined the word and still use it today!
by pimpsta7 December 28, 2005
Get the Dunmug. It is a slang word started out in Queens, NY
particularly the Queens bridge housing projects
It is a distortion of the word "Son" and is used to reference a friend or someone whose name you do not know
particularly the Queens bridge housing projects
It is a distortion of the word "Son" and is used to reference a friend or someone whose name you do not know
by DaT bOi EsCo January 11, 2008
Get the Dunmug. Originally used in greeting those who names are unknown to you or have been forgotten, dun has been revolutionized to act as a comma or pause in a sentence, indicating also that the following part is of significance and those around should stop what they are doing if possible and pay close attention. However "DUN" is also used when speaking with close friends and can take on several positions of a sentence.
"Ayo where ya going dun"
"Ayo dun, we bout to go down the road and handle buisnes"
"wassup dun" "safe dun"
"Ayo dun, we bout to go down the road and handle buisnes"
"wassup dun" "safe dun"
by The Raven July 15, 2003
Get the Dunmug. 
by Dave BD January 8, 2009
Get the Dunningmug.