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1.
An expression used when a person, or yourself, has done somthing extremely stupid and dopey
Person 1: Dude, I just hit my head on the door.
Person 2: HERP DERP.
door Kommandant 25 november 2009
 
2.
Another way of saying duh.
Stacey: I ordered the food, it will be here in 10 minutes.
Louise: okay when will it be here?
Stacey:herpderpderpderpdurrrr.
door TheObieOne 10 mei 2010
 
3.
the answer for every physics problem according to idiot hipsters that think they are so cool
Q: What is the force of gravity?
A: herp-derp
Teacher: you're a moron
 
4.
A rage face showing expression of dumbness or suprising.
Hey, look, it's the herp derp face!
door superworddude 16 mei 2014
 
5.
A word used for complete randomness.
Alex: I'm bored. Herpderp.
door SOMEONE WHO IS MIPPIN 23 maart 2011
 
6.
Herpderp is the smell of herpadermis.
Being able to smell ones face in the case they have herpes of the face.

The process of facial screening before sexual intercourse of the face
"i had to herpderp her face with my tongue to make sure she was clean
door HerbDerby 26 juli 2010
 
7.
Abe Harrington!
My boyfriend, Abe, is a herp derp!
door JoryPoopyPants 2 januari 2012