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3.
Noun. Someone who is slow, spasticated, handicapped or in any way mentally retarded.

Also an exclamation at one's own stupidity or the stupidity of a close party. Normally "hurpa-durpa-durp" (with added '-adurp's for added emphasis). Must be said in the fashion of a mongoloid.

Not to be confused with "hinga-dinga-durgen".
A: "Is like a turtle and a tortoise different cuz ones a reptile and da ova is a bird?"
B: "Stop being such a hurpadurp."

A: "OMG! Them things are liek only £20!"
B: "No, it says they're £200!"
A: "O right, I see... hurpa-durpa-durpa-durpa!!! *X-z*"
by Atomic440 February 06, 2010
 
1.
An expression most likely originating from the series South Park. The expression was used for expressing, through terms, either an obvious observation or a stupid phrase.

The term is also interchangable with similar terms such as: durp durp, hurp-a-durp durp, and da durp durp.
Situation "Stupid"
Person 1: "Dan thought that Iraq meant a woman's chest."

Person 2: "Hurp a durp."

Situation "Obvious"
Person 1: "Who's Madonna?"

Person 2: "Hurp a durp!"
by SkavenKnight July 09, 2010
 
2.
Something someone says during a stupid or obvious joke, OR, Something someone says to indicate that the person they are talking to is a retard.
Retard: Err... Is that chair got seatbelts?

Normal man: Hurp-a-Durp. Get in the car.
by RyanLeroy June 22, 2010
 
4.
This word is a root for the situation that occurs when your brain goes "pffffffff".
Example1: Steve: O marez i cant remember anything for the exam. Will: Man u jus Hurp A Durp!
Example2: Michael: Bro, ima herp a derp ur face dick!
Nick: bring it foooo!
by AzN Sensationz June 23, 2010