A phrase used when someone is being dumb or obviously didn't think out what they were about to say before they said it.
Teacher: "In this story, can anybody tell me what symbolizes death?"
Girl: "Whats death?"
Guy: "Really? You're straight derpin' right now"
by TheHerpaDerp March 23, 2011
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The act of doing something in a way that some would say is odd.
Guy1: what is he doing?
Guy2: Derpin'.
by Yoshichu March 16, 2011
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A measure of 'derpiness', or rediculousness. Not precisely defined, and ample for hyperbole.
This meme is rated about 100,000 derpines.
by MotlovCocktail December 14, 2016
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To snort a line of crack, or some sort of drug.
Ay man, you're lucky you got crack, I wish I was derpin!
by Hillathug January 22, 2010
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The act of doing something uncalled for, and or stupid, that relates nothing to the matter at hand.
Guy #1: Yo bro! Did you go to that concert last night?
Guy#2: Yeah! Fo Sho!
Girl: Hey guys! Do you wanna sign my petition to take soda out of the vending machine?!
Both Guys: Girl. Leave us alone, and quit Herp-a-Derpin'
by tkomast3r77 May 2, 2011
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The act of derping in the middle of an important conversation where info is crucial or dealing with something along the lines of personal emotions.

Uncalled derping in the classroom during a test, business meetings, interviews, orgainization, or with someone who is really hurting emotionally and needs you to be serious.
Person 1: I was talking to Amanda the other day about my grandma dying and she dirty derped me...
Person 2: WTF...she did? Thats harsh bro there is a time and place for everything, but to be Dirty Derpin at that time...
Person 1: Yea we were just sitting there talkin and all of a sudden derps...I mean its cool and funny, but that was uncalled for.
by cleadmau5 September 7, 2011
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