herping my derp 

a) humping the air.
b) doing the nasty.

Can be used in context of other people/things, like "herping her derp" or "herping its' derp".

a) Guy: Yo, did you see Miley Cyrus herping her derp on that award ceremony last night?
Guy 2: Yeah, looked like she was having a seizure.

b) "Yeah, I was herping my derp last night with that cheap skank, I think I have AIDS now."

herping my derp by r u srs June 28, 2010