Dun Dun 

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.

Dun Dun by KingfishRex May 26, 2010

dun dun 

ur people. ur ace

Chill out dun dun

dun dun by DatKiDD December 5, 2003

dun dun 

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

dun dun by TheWanAndOnly December 19, 2013

dun dun 

A mexician whine. Comes from "uh uh", but in spanish, and annoying.

Gordito: Hey, make me some tacos.
Jon: Dun dun!

dun dun by ZONE May 13, 2005

Dun Dun 

pronounced (doon-doon);

doing the dirty; making babies;
the act of performing inappropriate stuff aka sex

just another way to say sex without saying sex

"Did you hear that? He and his girlfriend are dun dun-ing each other..."

"There are too many dun dun scenes in (insert show/movie), I had to turn away to preserve my innocence."

Dun Dun by Bear_CO May 30, 2018

dun-dun

someone who dun-dun dem all

dey call her dun-dun...dun-dun em all!!!

dun-dun by Rae Nicole May 28, 2008

dun dun dun dun dun dun dun

when you don't know a songs name and it doesn't have any lyrics\

Jamie: ok google play me the song that sounds like this! dun dun dun dun dun dun dun
google: you fucking dumbass this is why nobody likes you, your such a fucking twat.

dun dun dun dun dun dun dun by urmompussyass123 August 31, 2020