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 7, 2010
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1. Normally for those who are witless or stupid.
2. To be scared and coughing at the same time.
A1: "Wow. This dude was derping a ton during his jog!"
B1: "I'm pretty sure that's asthma."

A2: "Wow. This dude was derping a ton during his jog!"
B2: "I'm pretty sure he was an idiot."
by mmmmmmmmmmmmmmmmmh December 4, 2020
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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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