A derp is a dumbass. Someone who always has a stupid look on their face. Also someone who never contributes anything of worth to anything ever. A worthless piece of shit.
Used in a sentence:

"That kid is a derp!"
by KingoftheDerpssss February 02, 2012
When you don't know what you're doing, or will do.
GF: What are you doing?
BF: *at home, doing nothing*:Derping it
Gf: Ok, well let me know when you're finished cleaning.
BF*thinking*: Dumb Bitch...She's gonna clean it.
by gigamar February 01, 2012
Someone who thinks that the joke:
"Why did the witch ride her broom?"
"Because her vaccuum was too heavy!"

is worth laughing about.
That Linda is such a derp for laughing at that joke.
by Courtney_Elizabeth2013 January 29, 2012
An incurable disease, at least until the introduction of Duck Sauce's "Barbra Streisand" with a combination of yelling "Unf Unf Unf" between two mirrors.
Kindoflike Bloody Mary three times, but this one actually works. 50% of the time.

It is known to afflict a certain Jason Liu's face constantly (See "Jason Liu" for more information)

Commonly associated with "Herp"
DocMo: "Hi what's your name?"
Jason: "Derp"
DocMo: "Barbra Streisand"
by kendaninjabinja May 02, 2011
a totally ridiculous person who abbreviates all their words and says that they have a ghat. popular sayings are nahnahnahnah and wanna die? Derps tend to live in basking ridge. subjects often say wheres ma ghat? they will also ask for qual rides to chip after prac whichs translates to quality ride to chipotle after practice. a list of common abbreviations are garb = garbage, ridic= ridiculous, imposs= impossible, ment= mental
Ridge Hockey Team, Derp Dan
by nyjets28 January 19, 2011
10. Something obvious.
Person #1: What?

Person #2: I love you, that's what. Derp! :P
by Inaia December 18, 2010
The state of being cross-eyed and generally looking stupid, possibly with some showing of teeth for effect. Being derp can be voluntary or involuntary
You would be derp if you lost your retainer, were perplexed by something etc.
by Daraghderp November 13, 2010

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