1)Some one who is a either a retard or stupid looking

2) Something random to say in a awkward situation
Look at that guy being a derp.

That derp is giving me eye cancer from looking at him.

Person: I'm Bi

Person 2: DERP
by Moosic June 10, 2016

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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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