A person who is a dumbass, schmuck etc.
That guy is such a derper, why is he listening to the backstreet boys?
de PJisJesus 15 Decembrie 2007

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Top Definition
The language in which the ends of certain words and/or syllables are replaced with "-er" to provide an enriching and fulfilling sentence.
"Sclerper derper?"
"Actually, flerper derper skerper, indeed."
de Chrilerper 22 Iulie 2006

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A herpderper.
Derper is herpin' & derpin' all the ding dong day.
de herpderper420 18 August 2011

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a person who cums too early; or someone who fucks it up, can be used in many different scenarios. refer to example
"Man I really derped that exam"
"He's terrible in bed, such a derper"
or just plain "you fuckin derper!"
de harry couter 21 Octombrie 2008

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A non existent word made up by the "smartest" women in the world, shortly thereafter discredited by the smartest man in the world.
Haha yeah you derper
de asdfsdagasdgdsagfdgsadfgewasvc 10 August 2012

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the combo of the Dr. and Pepper in Dr.Pepper derper
man i could use an ice cold derper
de mason1991 10 Septembrie 2008

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