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Derpy - a homicidal rapist usually hailing from Hawaii, often with the intentions of slicing off people's penises and jellifying them for their scorpion overlords.
Baron Von Muffington is such a Derpy!
Derpy by Boss Nigger. August 5, 2012
Something that can explain something that is cool or dumb.
1)Man this song is so derpy!
2)Yah, that guy is such a derpy derp!
Derpy by Rob June 17, 2004
A universal nickname for that really annoying girl that everyone hates. She could be your clingy ex-girlfriend or the girl in your government class that always asks stupid questions. If she's "Derpy" then chances are that everyone you know can find something they hate about her.
"Dude, derpy showed up at my house yesterday, she's so creepy!"

"Are you talking about that blonde chick with the annoying voice? I hate that chick, she gets on my nerves."
Derpy by thedirtydan May 17, 2013
Quirky or very day dreamy or embarrassing. Mostly how to describe a person or object
Man jeffery , that guy is really derpy
Derpy by Bitchplease1212 January 3, 2016
Let's get derpy after work.
Derpy by Ryan_Goosling January 10, 2018
A character, or enemy in a game who is terrible and can beat noone. This does not apply to players. A player of this description is known as a noob.
Joe: man I love Minecraft squids

Tom: why?

Joe: cause they're so derpy
Derpy by friendofthewiz July 7, 2015