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
Australian. Abbreviation of underpants.
Johnny busted Sarah wearing only her derps.

In summer, I sleep naked apart from my derps.
by spruce_goose June 22, 2005
See also herp:

Derp is a word that can replace anything in a sentence. It is somewhat of an everyword, such as fuck. Derp is most commonly used in le rage comics.
"Yo Derphina"
"Lets go to the herp n Derp"
"you look so derpy"
by Zombies<3 October 23, 2011
The action of pure randomness and retardation.
Guy 1: My entire family just died!!!!
Guy 2:..........derp!
by itzadolfin!! May 10, 2011
a totally ridiculous person who abbreviates all their words and says that they have a ghat. popular sayings are nahnahnahnah and wanna die? Derps tend to live in basking ridge. subjects often say wheres ma ghat? they will also ask for qual rides to chip after prac whichs translates to quality ride to chipotle after practice. a list of common abbreviations are garb = garbage, ridic= ridiculous, imposs= impossible, ment= mental
Ridge Hockey Team, Derp Dan
by nyjets28 January 19, 2011
The only word that can cause world peace if used correctly. Only chuck norris knows the correct gesture and accent that will cause this to happen.
hey, your that guy who beat my wife at the bar last night! why did you do that!?" "uhh... herp de derp!"
by RageToast October 23, 2010
a stupid joke that you could see a mile away
derp de derp de derpidy derp
by jonnyg August 31, 2006
A sexual act where one inserts their tongue into another's anal canal.
"Dude, I totally derpped that girl."

"Wanna derp?"

"We were derpping each other."
by iBanged Zooey November 19, 2013

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