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1. Herpderp
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.
2. Herpderp
A word used for complete randomness.
Alex: I'm bored. Herpderp.
3. HerpDerp
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
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