A word utterred when one screws up. origin: Matt Stone and Trey Parker in BASEketball. Used as an interjection.
(Imagine a scene where a guy is sniffing a girl's underwear, only to discover it is her mom's) DERP!
by Broc March 7, 2004
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Kevin, upon seeing the large quantity of lasers, began derping.
by Kat the Scalie December 3, 2020
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1: The word that describes a particularly retarded face: A retarded smile, and the eyes pointing in different directions.

2: A word merely used as filler
1: Used in a picture (let's use the megaman image just for the hell of it), derp is the quintessential word for itself. 'Nuff said.

2: Person 1: "So... I'm bored"

*5 minutes later*

Person 1: "Derp..."

Person 2: "Yeah"
by aliatos August 24, 2009
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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 19, 2011
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A word used after a stupid joke, or stupid slapstick. It was first used in the South Park episode "The Succubus," but popularized by later episodes. Commonly used to refer to jokes in Rob Schneider movies.
Rob Schneider derp da derp! Then, derp da derp ta tittily tum.
by Sue Don M. December 2, 2007
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A literary or spoken phrase that combines elements of "WTF" and "cool story bro". Laced with condescension "derp" is a common form of web-based libel that is almost didactic; however not quite as it is generally a sardonic gesticulation rather than moralistic chastisement. The spoken sense of the world itself conveys an intrinsic feeling of disappointment with a subtle hint of disgust and an overtone of rebuke.
Joel: "I'm a lyrical genius!"
Devon: "Derp."
by Jove Lenod December 6, 2011
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