look up any word, like donkey punch:
 
36.
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
 
37.
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
 
38.
A literary or spoken phrase that combines elements of "WTF" and "cool story bro". Laced with condescension "derp" is a common form of web-based libel that is almost didactic; however not quite as it is generally a sardonic gesticulation rather than moralistic chastisement. The spoken sense of the world itself conveys an intrinsic feeling of disappointment with a subtle hint of disgust and an overtone of rebuke.
Joel: "I'm a lyrical genius!"
Devon: "Derp."
by Jove Lenod December 06, 2011
 
39.
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
 
40.
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
 
41.
The universal replacement for any words.
"dude, stop being such a baby" - "dude, stop being such a derp"

"you've got to be f**king kidding me!" - "you've got to be derping kidding me!"

"did you end up going to the party last night?" - "did you end go going to the derp last d'dd?"
by Derpady Derp August 30, 2011
 
42.
a stupid act committed by an individual which is regretted in retrospect.
passing out with your shoes off at a party is considered a MAJOR derp
by ferral penguin June 26, 2011