Someone who defies the laws of stupidity by being really, really stupid and derpy.
Melinda: I made a character named Aaron Brancher. He's going to be a rancher!
Friend: God, Melinda. You're such a derp.
by camille is black May 18, 2011
A foul up. If someone is not doing their job correctly. A mistake. An unfortunate mishap. An event that disrupts the activity of others.
A man driving a truck runs over a speed bump and passengers are unaware of the speed bump so that was a derp. Someone is neglegent on the job and a colleague yells "derp"!. Someone gets an infection in a third-world country. I got an infection in another country so that was a derp. Someone does not tend to required tasks of their job which leads to foul ups. I should have been paying attention so that was a derp.
by George Korr March 04, 2006
a cigarette
yo man, toss me a derp bro
by VVVFFFFFF August 09, 2008
A state of being. To be extremely messed up, usually from excessive amounts of good marijuana.
WOW that purple was delicious, DERP!!!
by SAMPSON September 10, 2003
A derp is the guy in the bright clubby striped shirt who waits in line for 2 hours to get into, well, a club. Granted, it’s nighttime, but the derp still wears the euro-trash sunglasses. The derp has far too much pomade in his hair. On top of this, the derp acts like he is a member of high-society, when in fact the derp is actually just high-maintenance white trash.
let's get out of this bar, it's loaded with derps.
by fycfan#1 March 31, 2005
1. Male genitalia (aka. Johnson, Purpleheaded-yogurt slinger, schlong, etc.)
Scott: Hey Michael, you suck man.
Michael: Slurp my derp Scott.
by Mawilson06 October 11, 2005
a word used at the end of almost every sentence by anyone with a song in their heart. can also be used to express almost any feeling imaginable, so people can read your minds easily.
Fear- "Oh no! a hungry pack of flaming aligators!DERP!"
Surprise- "Ninja stars were just teleported into my intestines!DERP!"
Recovery from bad joke- "So he said 'what wife!'......a-DERP!" (rolling laughter)
by Blaine December 25, 2003
(Origin: This word was first used to my knowledge seven years ago when a friend of mine renamed an enemy in a video game from Dorp to Derp because it sounded funny.)

1: A stupid or incompetent person who believes that they are intelligent.
(I.E. President Bush)
2: A pathetic or unworthy adversary or opponent.

1: An intentionally stupid joke or action used to create a self-parody.
2: An easily aviodable mistake or flaw that is not addressed until it is too late to alter or fix.
<i>1: Man, our President is such a derp.
2: Those derps never stood a chance against me.</i>

<i>1: That joke was such a derp.
2: I really did not see the derp in my plan until it was too late.</i>
by Cheesus Crust January 16, 2004

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