A person who is a dumbass, schmuck etc.
That guy is such a derper, why is he listening to the backstreet boys?
viết bởi PJisJesus 15 Tháng mười hai, 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."
viết bởi Chrilerper 22 Tháng bảy, 2006

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A herpderper.
Derper is herpin' & derpin' all the ding dong day.
viết bởi herpderper420 18 Tháng tám, 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!"
viết bởi harry couter 21 Tháng mười, 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
viết bởi asdfsdagasdgdsagfdgsadfgewasvc 10 Tháng tám, 2012

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the combo of the Dr. and Pepper in Dr.Pepper derper
man i could use an ice cold derper
viết bởi mason1991 10 Tháng chín, 2008

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