Derpin' 

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"

Derpin' by TheHerpaDerp April 8, 2011

Derpin' 

The act of doing something in a way that some would say is odd.

Guy1: what is he doing?
Guy2: Derpin'.

Derpin' by Yoshichu April 1, 2011

Derpin 

To snort a line of crack, or some sort of drug.

Ay man, you're lucky you got crack, I wish I was derpin!

Derpin by Hillathug January 22, 2010

Derpin 

The derpy dolphin.

All hail the only derpin!

Derpin by Greenfrappedrinj December 19, 2014

Herp-a-Derpin' 

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'

Herp-a-Derpin' by tkomast3r77 May 24, 2011

le me derpin 

A phrase that describes a particularly retarded face: A retarded smile, and the eyes pointing in different directions.

*le me derpin

Mom: What are you doing?

Me: I'm derpin. See my derp face?

le me derpin by derpette123456789 April 29, 2012

Dirty Derpin 

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.

Dirty Derpin by cleadmau5 September 8, 2011