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

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Usually a dumb kid with less knowledge then others, usually temporary, but can sometimes be forever.
yo dawg that kid was derp fo shure
by antl3r September 18, 2016

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Describes a person who reminds others of a potato
She is a derp, lol!
by Derpy_heichou October 12, 2016

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In always means someone who is literally a potato
I'm such a derp!
by Derpy_heichou October 12, 2016

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A nooby or pointless person, this word can also be meant as a way to say someone is stupid. See noob for the way derp can be meant in video games.
That guy is so derpy. He is totaly a derp, does not even know how to reload
via giphy
by StickmanOfDoom March 13, 2016

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Acting or looking VERY goofy.
Hunter Collard stop being a derp!
by _WIZARD_NINJA_ January 25, 2016

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Someone who is an unintelligent asshole.
He/she is such a derp.
by Sbi_Lynnie January 10, 2016

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Someone with low intelligence, or a stupid decision.
That guy is such a derp.

I just dun derped.
by Stgiga November 11, 2015

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