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
The action of pure randomness and retardation.
Guy 1: My entire family just died!!!!
Guy 2:..........derp!
by itzadolfin!! May 10, 2011
Symbolizing a retarded face, look, etc., making fun of it.
Im the Joker, Batman! DERP!
by BATMAN DERP February 06, 2011
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
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
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