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1.
da dun dun is something you say when you have nothing else left to say to somebody that is making you mad, or that you dislike (after you say it you walk away)
Hater "Your hella stupid"
Person "Da dun dun bitch"
by sharapstar October 11, 2010
 
2.
When in an argument, or conversation and you no longer feel like talking.
You know what Dadun Dun

First said by: Nicki Minaj
by Legend Ramsey jax April 06, 2011