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a really shitty person, who you can't trust.
ever
"duude, fuck that derpy"
derpy by Quirty300 March 6, 2018
1. To have committed an action of any kind which lead to a foolish or stupid outcome;
2. To be seen as foolish or stupid;
3. The name of a My Little Pony character, Derpy Hooves.
4. The perfect replacement for any word indicating an action, parodying it.

Similar: Derp, derpiest, (unit of measure), derpified, derps.
(Past Tense): to have derped.
"Derpy is as derpy does, Sir!"

"Quit licking the cat's feet - that's just derpy"
"Whenever I talk to you I get all shy . I get all derpy inside"
"Damn, that pretty girl just derpified me."
"Word - Up Derps! How are yah!"
"That is the derpiest thing I have ever seen. Who knew an eye socket could stretch like that..and why use a pylon??"
"I just completely derped up that assignment. I doubt I'll pass the school year."
"This ain't for the best, my reputation has always been derpy; you must like me for me."
"That dog just ate that other dog's poop! How Derpy!"
Derpy by Marcel LeWord June 5, 2018
derpy
adjective

accident prone, but lovably so; perhaps so much so that it makes one look foolish. Heroic and loveable, facing the adversity of being prone to such accidents, perhaps due to a disability with good cheer and a positive attitude.
I've been feeling pretty derpy today, knocking everything over and dropping stuff, but my friends helped me through it.
Derpy by Easysnuggler August 18, 2018
Me, because that is my nickname. We will use other names to protect privacy.
Dad: Dave, walk the dog.

Me: where's the leash?

Dad: In your hand, Derpy.

Me: Derp.
Derpy by FanOfMaxJacobs_YT October 10, 2018
Felix Micholas Talandis
Felix: Was I derpy when I refused to believe that Jacob's middle name was Jamal
Jacob: Felix not only was that derpy but that was disrespectful to me and my family
Derpy by Agen125678 March 20, 2019
when you do something really dumb, and weird, its called derpy.
your so fucking derpy