1) The sound of a Brain-fart, usually when a fairly smart person says something that's rather silly by accident or the wrong word or can't think of what to say.

2) Breaking something or crashing into something due to thinking too much.

3) Being silly and not caring what other people think of you. See dork
"It'd work better if you used contrasting colors. No, not contrasting -- Contrasting. Not contrasting! You should use contrast-gah! Do you know what I'm trying to say?"
"Complimentary?"
"Derp! YES! THANK YOU!"

"Did you hear the professor walked into a wall today while working on his latest thesis?"
"Ha! No I didn't. He's such a derp"
by mindthederpface March 28, 2013

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Expression used in multiple ways. Usually used to describe an obvious or stupid situation.
Example 1: "Monica is meeting us at 7pm here" "What time?" "Derp"
by Zack Alv March 25, 2008

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a stupid joke that you could see a mile away
derp de derp de derpidy derp
by jonnyg August 31, 2006

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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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