The state of an adversary you repeatedly fire at, but miss all shots. (The phrase was coined when a man, cornered, put his back to a brick wall. When he was fired upon, most shots went over his head; the bullet penetrating the brick and creating little chunks. The chunks fell on the man in turn and it looked as though he had been seasoned)
Word co-opted by douchebag celebrity blogger Perez Hilton (otherwise known as Mario Lavandeira) in an extremely lame attempt to create cool new slang to enter into the vernacular. Failed miserably. Also, see pepper.