The sound an idiot makes when mocking someone with laughter for
something that said idiot does not understand. Also used following primitive behaviour pertaining to objects of the civilized world (such as slamming a door, carelessly slamming down one's glass onto a table so the
liquid within sloshes about or needlessly hitting
something until it works).
"You think that someone who isn't intelligent, knows a lot - dur-hur-hur - you're actually
retarded!"
"Uh, stupid thing - it doesn't
work" bangs fan on desk and inadvertently hits its power
button "Duh-hur-hur! I fixed it!"