A saying, spoken out loud, while acting as a slow or mentally challenged person when someone makes an incorrect action or is unwillingly blind to something obvious.
Guy1: WHERE IS HE!?!?!
Guy2: In front of you in the bushes. ERPA DERP!
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A purple retard, or a purple mentally challenged person.
There is a purple derp down in Florida.
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A phrase said by idiotic morons who think they are cooler then they actually are.
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Is a word that describes a particularly retarded face: A retarded smile, and the eyes pointing in different directions aswell as a wierd fraze such as...Derpdy
Normal person: "Hey, whats up?"
Connor White: "Derp herpa flerp merp der gerp"
Normal person: "Speak normal you derpy dick"
Connor White: "DERPPPPPPPP"
Normal Person: "Calm down"
Connor White:"wa"
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Insulting name for a Marxist expressing delusional thoughts. When your conversation with Marxists inevitably leads to purely emotional and illogical arguments, Comrad Derp has made an appearance.
Socialism will work this time, exclaimed Comrad Derp.
History, science, and mathematics mean nothing to comrad derp.
Caused by a lack of masturbation
Krista has derp eye, must have been a while.
The act of being, being with, or being as close as possibly can be, of, or to a Jack.
1; Holy crap, Ka-derping is the most amazing, vigorous, complicated activity ever!
2; Madison is the Ka-derping Queen!