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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.
by Kommandant November 25, 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.
by TheObieOne May 10, 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!
by superworddude May 16, 2014
 
5.
A word used for complete randomness.
Alex: I'm bored. Herpderp.
by SOMEONE WHO IS MIPPIN March 23, 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
by HerbDerby July 26, 2010
 
7.
Abe Harrington!
My boyfriend, Abe, is a herp derp!
by JoryPoopyPants January 02, 2012