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1.
"Hurr durr" is the sound of laughter coming from someone with half a brain.
Mostly it is used to point out when someone has made an idiotic claim, though, surprisingly, idiot males will attempt to make thier laugh as deep as possible to make them sound more manly, when all it really does is make them sound like idiots.
"Hurr durr, 2 plus 5 is 6"
by L33t_Masta June 20, 2008
 
2.
In the english language, hurr durr can be defined as "HI THERE!"

However, in idiotic terms, we say "HURR DURR!"

It is often said to describe idiocy, or silliness.
...hurr durrrrrr
by emmerdork December 10, 2010
 
3.
Coming from the word "harder" , it is the sound that women in pleasure make when they want to more. When you hear this, it is a sign that they are in genuine pleasure, otherwise you will just hear "harder" (when they are faking it).
HURR DURR TOMMMMM, MMHMMMM!
by TROLLER69 November 19, 2010
 
4.
Hurr durr is a dutch battle call. It comes from 'harder' and means 'faster'.
That beat is not hard enough. We want it to go hurr durrr!
by BlackendWhiteSheep May 04, 2010