look up any word, like cleveland steamer:
 
6.
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
 
29.
A word that means pretty much nothing. Something to say when there is nothing to say. It goes with the word Herp which is essentially the same thing.
Mayumi: Derp
Yuuma: I am going to make "derp" into a real word!
People watching: Herp Derp
by Mayumi Bloodraine July 10, 2012
 
30.
an expression of stupidity (noun)
an act of stupidity (verb)
AJ Fleming loves to say derp; one of his favorite things to say is "Obama derped up the government."
by Avrum F., my fake name March 09, 2012
 
31.
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
 
32.
a stupid person, or action
"Danny, your being a huge derp right now.
by MrSexy282 May 21, 2010
 
33.
1: The word that describes a particularly retarded face: A retarded smile, and the eyes pointing in different directions.

2: A word merely used as filler
1: Used in a picture (let's use the megaman image just for the hell of it), derp is the quintessential word for itself. 'Nuff said.

2: Person 1: "So... I'm bored"

*5 minutes later*

Person 1: "Derp..."

Person 2: "Yeah"
by aliatos August 23, 2009
 
34.
Describes a person who usually adds retarted remarks or statements to a conversation. The speaker is usually mocked and teased afterwards and sometimes forced to wear a DERP HAT and told they are full of Derp or the derp is strong with them
A person spots the obvious during a conversation, everybody then says to the person HURR DERPA, HERPA DERPA HERPA HURR. HERPY DERPY HURR.
by DERPA Herpa April 30, 2009
 
35.
Expression used in multiple ways. Usually used to describe an obvious or stupid situation.
Example 1: "Monica is meeting us at 7pm here" "What time?" "Derp"
by Zack Alv March 25, 2008