a phrase used when someone makes a mistake, or says or does something stupid or ridiculous.
shannon: i wonder what frozen ice cream tastes like... ?

peta: derp
by A+inprocrastination June 07, 2011
a word to say in place of other words. can be used as any part of speech. it is usually used as an interjection.
guy 1: Aw dude! i blew myself up in minecraft!
guy 2: haha derp!
guy 1: shut up your a derp garrett
guy 2:well your more derpy than anyone i know!
by mwahahaiwillruletheworld December 13, 2011
derp-Interjection

Used when replying to a previous statement that is either 1)irrelevant, 2)unintelligible or 3)pointless.
1) following a conversation that had revolved around riced out cars, Jim adds:
"Does anyone else think that corn dogs looks like rats having sex?"
-DERP!

Jim after smoking weed:

"I woke up, or was I already awake? It doesn't matter because THE CAT WAS STILL sleeping!!! ISN'T that odd?
-DERP

3)The sun hurts eyes!
-DERP!
by DFreshalot September 28, 2011
From South Park. Originally meant to be said when someone does or says something dumb. Now, said by douchebags and trolls for any reason whatsoever...or sometimes none at all.
John F Kennedy: "Do not pray for easy lives. Pray to be stronger men."

Lindon B Johnson: "Derp."
by GIVEmEEEEEEEEthePower June 11, 2011
a stupid person, or action
"Danny, your being a huge derp right now.
by MrSexy282 May 21, 2010
Someone who is generally awkward. Stands around awkwardly and makes everyone around him tense. A derp often is the type that tries to do something cool/risky and fails horribly the first time.
Person 1: "Whoa he managed to crash his dad's car the first time he drove it?"
Person 2: "Yeah, he's a derp."
by killacam53 March 25, 2013
Universal word that can mean anything.
"That was derping awesome"

"Teach me how to derp, teach me-teach me how to derp"

"Go derp yourself you derping piece of derp!"

"Derp you!!"
by JvMarsh November 20, 2011
From the Online multi-player game, World of Tanks, it refers to the biggest and most explosive slowly reloading gun that one can have for a particular tank.
Hey, do you have derp on that KV tank? No, I have the stock gun. Noob.
by SiemaUSA October 15, 2011

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