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

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Derp- a caption used on silly pictures such as memes.

A word to say after saying something stupid, or derpy.
A word meaning stupid.
Me: "Did u know that butter is a vegtable!?!"
Hater: "No it not you derp!"
Me: "oh, ok"
by TheAllyDerp March 07, 2014

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As used to describe a person who acts like, well....like a Dumb Egotistical Retrograde Prick. Give 'em a hammer. They'll do the rest.
This guy is a total DERP.
by mtnmedic January 08, 2014

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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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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

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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

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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

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