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7.
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
67 60
 
8.
A word that can mean many different things; usually negative. It can be a noun, verb and adjective. Synonyms include stupid, retarded, idiotic, idiot, dumb etc...

Variations of the word include derpy, derped, derpette, derpity der hurrrr. Herp is also related to derp and usually follows derp in a derpy interjection. Herping is almost always a verb, and when in combination with derp it does not have to be negative.
Noun: "Wow, that guy is a derp"
Verb: "Wow, that guy just derped everything up"
Adj: "Wow, that guy is derpy..."

Misc examples:
Person A: "Derp de durrrr... herp derp?"
Person B: "Herpity derp hurrr... Derp derp?"
Person A: "Hurrr :/ "
by FecesExplosion January 24, 2013
31 30
 
9.
The First Real and proper definition for "Derp" Was basically just a response for if something or someone did something so utterly retarded or screwy, You literally have nothing else to say, Derp is what you say when you have nothing to say.
Your friend super glued a pencil to his shirt so he wouldn't lose it.

You say, "....Derp"
by Founder Of Derp (really!) December 13, 2010
362 361
 
10.
the sound muttered, spoken, and/or by some mumbled after an instantaneous moment of extreme stupidity.
you:I HAZ MORE SODA THAN YOUUU! *derp*
Super Market: you're an idiot.
you: derp derp derp.
by THEKOOLKAT July 25, 2010
223 223
 
11.
A huge and dramatical case of retardation
Derpy derp derp
by Derps October 26, 2010
142 141
 
12.
Derp- a caption used on silly pictures such as memes.

A word to say after saying something stupid, or derpy.
A word meaning stupid.
Me: "Did u know that butter is a vegtable!?!"
Hater: "No it not you derp!"
Me: "oh, ok"
by TheAllyDerp March 07, 2014
3 6
 
13.
One who, in an argument, takes a position, and when that position is destroyed by evidence and well-reasoned argument, acts as if the reasoned argument never happened, instead sticking to his original position while resorting to logical fallacies such as bad math, unwarranted assumptions, appeals to emotion, wishful thinking, false and deliberately misleading data and analysis, or ad-hominem attacks on his opponents. One who argues in bad faith.
Paul Ryan is a derp.

Salim Furth is derpy. Can put links here, search on yes-europe-really-is-in-the-throes-of-austerity

Avik Roy exhibits derpitude. Search New Republic. Search also Krugman blog bad-faith-and-civility-health-care-edition: "If someone says the sky is green, you prove that it’s actually blue, and the next day he comes back once again insisting that the sky is green, and this happens repeatedly, you eventually have to acknowledge that mannerly debate about the color of the sky just isn’t enough; you have to go meta, and talk about the fact that this guy and his friends just aren’t in the business of honest discussion."
by H. Rider Haggard June 07, 2013
98 99
 
14.
From South Park. Originally meant to be said when someone does or says something dumb. Now, said by douchebags and trolls for any reason whatsoever...or sometimes none at all.
John F Kennedy: "Do not pray for easy lives. Pray to be stronger men."

Lindon B Johnson: "Derp."
by GIVEmEEEEEEEEthePower June 11, 2011
152 154