1) The sound of a Brain-fart, usually when a fairly smart person says something that's rather silly by accident or the wrong word or can't think of what to say.

2) Breaking something or crashing into something due to thinking too much.

3) Being silly and not caring what other people think of you. See dork
"It'd work better if you used contrasting colors. No, not contrasting -- Contrasting. Not contrasting! You should use contrast-gah! Do you know what I'm trying to say?"
"Complimentary?"
"Derp! YES! THANK YOU!"

"Did you hear the professor walked into a wall today while working on his latest thesis?"
"Ha! No I didn't. He's such a derp"
by mindthederpface March 28, 2013
As used to describe a person who acts like, well....like a Dumb Egotistical Retrograde Prick. Give 'em a hammer. They'll do the rest.
This guy is a total DERP.
by mtnmedic January 08, 2014
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
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
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
Anything and everything. I can mean whatever you want it to be.
Person 1: What a derp.
Person 2: I know, he be derpin.
by whoopwhoopshawhoop95555 June 08, 2011
Symbolizing a retarded face, look, etc., making fun of it.
Im the Joker, Batman! DERP!
by BATMAN DERP February 06, 2011

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