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"
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a stupd person or group of stupid people
james: yo look at my new K Swiss
Zach: Nobody wears K Swiss you dun da dun!
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