1) The sound of a Brain-fart, usually when a fairly smart person says something that's rather silly by accident or the wrong word or can't think of what to say.

2) Breaking something or crashing into something due to thinking too much.

3) Being silly and not caring what other people think of you. See dork
"It'd work better if you used contrasting colors. No, not contrasting -- Contrasting. Not contrasting! You should use contrast-gah! Do you know what I'm trying to say?"
"Complimentary?"
"Derp! YES! THANK YOU!"

"Did you hear the professor walked into a wall today while working on his latest thesis?"
"Ha! No I didn't. He's such a derp"
by mindthederpface March 28, 2013

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106
The face made by Gerard Piqué of Spain (a.k.a. The Herp Derp King).
Piqué is herpderpin' at the World Cup.

-Piqué sees a ball-

Piqué: DERP!
by BEASTLYBEAST12345678901 July 27, 2010

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107
A comment, somewhat incoherent and illogical, that attempts to sound profound. Often a symptom of Obama Derangement Syndrome.
Politician: "Our opponent...is someone who sees America, it seems, as being so imperfect, imperfect enough, that he's palling around with terrorists who would target their own country. "

Sensible Viewer: "That is some considerable derp."
by Nebulious June 20, 2010

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108
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"
by Hammond511 March 14, 2012

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109
Degradingly erotic reproductive practices, recommended only for the most masochistic, wanton harlots. Subject usually has difficulty walking for like a day.
Shut yo' mouth and open yo' legs, bitch, yo' in for some srs derp.
by usernameunavailable November 09, 2011

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110
The vocal sound to describe a act of dumb, or a view/image of dumb, seen as a meme, and used on image boards(websites unlisted for certain reasons).
derp!
by Crausy December 31, 2010

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111
a derp is an unflattering photo of a person's contorted face taken by mistake
usually makes the person seeing the photo laugh and the person in the photo cry with shame
Google "derp" and try not to laugh.
by katherineeee! November 15, 2010

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112
Has several meanings, but used in a situation where someone has done/said something retarded, and so "derp" is a socially acceptable to say post-retardedness.

This meaning is most commonly used (originally, atleast) in Coventry, England.

Pronounced "durrp." See "yarp" from the film "Hot Fuzz" The way Michael says "yarp" is similar in the way you say "derp."
Person 1: Omg, i thought i saw a cat, but it was a dog, but yeah. I failed alll my gcses.

Person 2: Derp. (retard face)
by Shaun-e-e-e September 08, 2010

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