A word created by Matt Stone and Trey Parker, some time ago starting around the time of cannibal the musical. it is a term of saying something along the lines of "oh shit i am fucking retarded". More people might recognize it the word with the character Mr. Durp whom replaced Chef, and when he would say something stupid would hit himself in the head with a fucking hammer.
"If you loved Chef you'll love Mr. Durp *Whack* 'DURP'".
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