The act of being repeatedly bumped into by a person being humped. Usually seen in cases in which you and the humpee are sitting down next to each other.
John: Did you see Kyle hump Brenda on that bench today?
David: Actually, he was third party humping me. So yes, I did.
David: Actually, he was third party humping me. So yes, I did.
by Scarred Victim of This March 29, 2011