The sound between scenes in Law and Order. The expression originated when
4chan changed the "Post
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.