To be inefficient, slow, unable, inexperienced, not working correctly, stupid, naive, etc. A word that usually takes the place of "retarded."

Can be pertaining to a person or a thing.
I tried to send my essay in via email last night, but my computer was being derpy.

*Friend trips and falls over own feet
You are so derpy sometimes
by Derpyhoovs July 27, 2011
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Top Definition
Awkward or embarrassing, especially pertaining to a person.
"Man, that guy is so awkward!"
"Yeah, he's really derpy."
by SiriusLG January 20, 2010

accident prone; perhaps so much so that it makes one look foolish
I've been feeling pretty derpy today. Everything I touch seems to fall apart, and I cannot seem to do anything right.
by Count Schlick February 29, 2012
Clumsy or uncoordinated; prone to cause accidents likely due to some, often humourous, mental lapse.
Ugh, I feel so derpy today. I just filled the coffee maker with pencil shavings and tried to write something down with a coffee bean.
by Count Hieronymus Schlick March 21, 2012
Not "all there in the head"; possibly lacking intelligence or common sense. The wall-eyed background character in "My Little Pony: Friendship is Magic", Derpy Hooves, is named after this.
Hey, look at that guy sticking his aluminum foil-wrapped dick into an electrical outlet. That's derpy if I've ever seen it.

Derpy is best pony.
by datSato December 31, 2011
A disease (perhaps contagious) symptomized by using continuous "derp" actions.
"Man, I think Micheal has derpies."
"I know a few people who certainly have derpies."
by Lsh14 April 27, 2010
Ridiculous; Random; Silly usually to describe another person or image.
That picture looks really derpy.
by CJK909 January 13, 2015
Clumsy and foolish
My dog is so derpy,he bumps into things.
by Jackie Gurl March 31, 2015

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