The sound between scenes in Law and Order. The expression originated when 4chan changed the "Post Successful" page and font to look like the Law and Order black screen between scenes. The page played the sound, "Dun Dun," from Law and Order. 4chan /b/tards began to post the expression, "Dun Dun," anywhere to import a sense of finality or just randomly.
Tits or gtfo. Dun dun.
ayon kay Transmigraine ika-25 ng Mayo, 2010
someone who dun-dun dem all
dey call her dun-dun...dun-dun em all!!!
ayon kay Rae Nicole ika-28 ng Mayo, 2008
When a person can't get himself to talk about a certain ongoing subject (normally on chatrooms) and is put in a awkward situation, where some might expect a reaction from him and he goes,

"dun dun."

It comes from "so done with this". Usually related with Otaku culture for some reason.
Person 1: I just raped this bitch so fucking good, i swear i did.

Person 2: Hahaha so funny!

Person 3. o.o.. dun dun
ayon kay TheWanAndOnly ika-19 ng Disyembre, 2013
ur people. ur ace
Chill out dun dun
ayon kay DatKiDD ika-05 ng Disyembre, 2003
A mexician whine. Comes from "uh uh", but in spanish, and annoying.
Gordito: Hey, make me some tacos.
Jon: Dun dun!
ayon kay ZONE ika-13 ng Marso, 2005

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