a phrase used when someone makes a mistake, or says or does something stupid or ridiculous.
shannon: i wonder what frozen ice cream tastes like... ?

peta: derp
by A+inprocrastination June 07, 2011
A huge and dramatical case of retardation
Derpy derp derp
by Derps October 26, 2010
1, an exclaimation made after a moment of incredible stupidity or massive failure.

2, a facial expression with crazy eyes and a stupid lip.

3, when accompanied by a " :3 " indicates happy moment, or blushing with out making the user feel as stupid as they would if they wrote *blush*
guy 1 "she's fiiiiiiine, think I'll get any tonight?"

guy 2 "she's a lesbian."

*derp*
by omnomnomkittiez January 08, 2011
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
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
Someone who is generally awkward. Stands around awkwardly and makes everyone around him tense. A derp often is the type that tries to do something cool/risky and fails horribly the first time.
Person 1: "Whoa he managed to crash his dad's car the first time he drove it?"
Person 2: "Yeah, he's a derp."
by killacam53 March 25, 2013
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
To have a retarded face, or expression causing others to find it funny, creepy or just plain stupid.
Ex. 1 Jennifer Lawrence is the queen of derp because of the faces she makes.

Ex. 2 "I'm bored."
"Me too."
*Awkward silence.*
"Derp."
"Yeah..."

Ex. 3 Jennifer Lawrence Queen of Derp trended on Twitter worldwide. (FACT)
by Swim-on-and-on-and-on.... September 07, 2012

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