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
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
just something random that you say
"DERP"
by jfnvbghdfjvbjfgbjdnjghdbtk January 03, 2015
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
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
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
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

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