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
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
an expression of stupidity (noun)
an act of stupidity (verb)
AJ Fleming loves to say derp; one of his favorite things to say is "Obama derped up the government."
by Avrum F., my fake name March 09, 2012
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
one that expells an action of a complete and total fail
*Person 1 tries to walk up the down escalator*
Person 2: DERP!
by DerpYou February 07, 2010
just something random that you say
"DERP"
by jfnvbghdfjvbjfgbjdnjghdbtk January 03, 2015
Someone who defies the laws of stupidity by being really, really stupid and derpy.
Melinda: I made a character named Aaron Brancher. He's going to be a rancher!
Friend: God, Melinda. You're such a derp.
by camille is black May 18, 2011
Anything and everything. I can mean whatever you want it to be.
Person 1: What a derp.
Person 2: I know, he be derpin.
by whoopwhoopshawhoop95555 June 08, 2011

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