I am assuming that you heard this new definiton while darting past some young bucks out there on those Sierras trails, when one of them turned to the other and said, "Cripes! Was that a roadrunner?" And his partner said, "No, it was this awesome amazing hiker! But don't bother looking for her any more,; she's already over the next hill by now."

I guess that would mean that from your POV, they were over the hill, too, but behind you.