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
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
A common slang term, with origins stretching far into the series 'South Park', but with recent utilization in the Internet culture. The term itself can be used in a variety of situations. Often used as a substitute for ones own self in a narrative story or explanation. Also used for a verb, to describe an action.

The Internet users of this term have evolved it to encompass the female gender as well, using Derpina to represent a woman.
Noun:

Derp (I) was doing the dishes when Derpina (Girlfriend) started nagging me about missing a spot

Verb:

Yeah so I was just Derping around the other day...
by Windex King June 09, 2013
When you look at yourself in photographs and you are clearly drunk. Your 'drunk face' in photographs.
Blair: Meredith you are so derp in that picture. How drunk were you?
Meredith: That is a solid derp.
by Derped March 24, 2013
A word dumb children use to make themselves seem cool inside of their circle of internet friends. Although, the younger generations have already started saying this word outside of the internet making them look even more retarded than they already are.
The only example I can give is for you to go derp at yourself in the mirror.
by Goddddddd September 24, 2012
A word used by a narrator who doesn't want to show /don't remember the identity of a character fom the story that he tells...The word was created and used frequently by 9gagers...users of 9gag.com for shorter and funnier storyes
"So i was with my friend Derp at this super cool club and there were so much cool people derping around.."
by 9gager February 28, 2012
A derp is a dumbass. Someone who always has a stupid look on their face. Also someone who never contributes anything of worth to anything ever. A worthless piece of shit.
Used in a sentence:

"That kid is a derp!"
by KingoftheDerpssss February 02, 2012

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