To cough and be scared at the same time. Typically used in situations involving lasers, french accents, and a lot of bore ragnarok.
Kevin: “Is derping still a word or is my inner boomer showing?”

Kevin was derping earlier.
by ARC Trooper 5555 December 08, 2020
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To be coughing and scared at the same time.
All that derping for nothing... it all worked out in the end.
by Dalektic December 03, 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 06, 2004
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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 23, 2009
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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 01, 2007
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