Slang for the lovely word "don't".
Pete: I'm going to throw your c.d.s out the window if you don't shut up!!
Self: Nu! Nu Pete, dun do it!

(Also see definition for nu.)
by Kaylahh July 29, 2006
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Dun is background music to sing when something bad or stupid happens.
Mary: I Forgot my book
Me: Dun Dun Dun!
by Yoko Mihama May 2, 2005
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a different way to spell done. Inspired by the smol bean, Josh Dun.
I'm DUN

I'm so josh DUN with you
by meme llama July 21, 2017
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When something random and unexpected happens, it is customary to shout DUN! at the top of your lungs. There are also numerous perverted uses of this word, i.e. "IM GETTING A DUN!", "LOOK AT MY DUN!", or I LOST MY DUN!"
The word was first used becuase of the movie Signs. As the alien walks by at the party scene, the sudden music and the unexpected alien suggested that DUN! be shouted. It is also used when a UPS truck drives by.
by Goker April 1, 2006
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It means Dun-Dun-Duuuuuun... You don't know what happens next.
Dun-Dun-Duuuuuun... means you don't know what happens next.
by pseudo!!! April 27, 2019
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