1 definition by harry couter
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!"
"He's terrible in bed, such a derper"
or just plain "you fuckin derper!"
by harry couter October 22, 2008