(verb) To scrounge desired items by any means necessary.
(noun) A person who implements the verb form of fiend.
Mike: Dude, its cashed.
Fiendy McFiend: Fuck you, there's at least two more hits in that!
Mike: Ew dude, stop fiending the morsels of my bread crust.
Mike: Holy shit, that guy rounded up like twenty asians to fiend the answers for that math test.