Originally rooted from the word "dun", meaning "son", dun son is an extension of it's root. Usually in reference to entering or exiting, never used during conversation. A Greeting.
"Yo whas da dealdun son?" or "Yo I'ma holla at you lata dun son"
I am josh dun with you son.
Person: Ryan was kneeling in the bathtub...
Taylor: Kanye-not
You: I'm so dun with both of you
Taylor: josh dun with you son
I am josh dun with you son.
Person 1: Ryan was kneeling in the bathtub...
Person 2: Kanye-not
You: I'm so dun with both of you
Person 2: josh dun with you son
I am josh dun with you son.
Person 1: Ryan was kneeling in the bathtub...
Person 2: Kanye-not
You: I'm so dun with both of you
Person 2: josh dun with you son