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The word derp actually derives from the acronym D.E.R.P which stands for the "Disgruntled Employee Retaliation Program" and is used when you are intentionally causing a job related derp. Derping is considered a verb.

The act of "derping" or "D.E.R.P-ing" can either be physical or verbal in nature and is always done intentionally... or maybe not if you're lucky.
Examples of derping are as follows:

1. Peter, Samir and I took the company car to lunch yesterday and in the act of derping we almost had all four wheels of the car off the ground. It was awesome!!!

2. You hate your job so much that you keep breaking the copy machine intenionally, but of course nobody knows this. ...Unfortunately, this will often lead you to overhear the statement "I hate this printer it never freaking works."

3. Someone hates their job at the Hamburger Hut so much that they like to tell people Hamburger Hut undercooks the beef patties just so people won't eat there.
by meesolab November 14, 2010

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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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just something random that you say
"DERP"
by jfnvbghdfjvbjfgbjdnjghdbtk January 03, 2015

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an expression of stupidity (noun)
an act of stupidity (verb)
AJ Fleming loves to say derp; one of his favorite things to say is "Obama derped up the government."
by Avrum F., my fake name March 09, 2012

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a person who acts strange,weird, and/or random, usually quite fun to be around due to the fact that this person is an oddball and does and/or says interesting things.
derp: -randomly shouts in the middle of the sidewalk- "Who put this beaver in my pillowcase!!!!"

-friends laugh and giggle-
by chaosweapon1 March 12, 2011

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A huge and dramatical case of retardation
Derpy derp derp
by Derps October 26, 2010

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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

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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

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