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
the sound muttered, spoken, and/or by some mumbled after an instantaneous moment of extreme stupidity.
you:I HAZ MORE SODA THAN YOUUU! *derp*
Super Market: you're an idiot.
you: derp derp derp.
by THEKOOLKAT July 25, 2010
Something you say when:
-Someone does/says somthing stupid
-You'e stuck with a noob (n00b)
-You are stuck doing something absolutely fucking horrible
-You come into contact with derp or anything derpy.
-derpo: What does ice cream taste like?
you: Derrrrrp

-n00b: h3llo r4nd0m p3rs0n wu75^ im d0|ng g00d wu7 @b0u7 ucr@zyp3r$0n
you: y0u $cr3@m!ng DERP 0f@ n00b

-person: go jump in a pool of sharks
you: go fuck yourself with a big stick, you fucking derp!

-derpyperson: you're so herpy-derpy!
you: DERRRRRRRRRP ON YOU, YOU DERPY DERP!
by Polyhedron the Great June 26, 2015
Dopehead Enjoying Raging Porn
Person 1: What are you doin', hot dawg?
Person 2: Derp.
by Anon9498 May 27, 2015
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