sockdolager

noun3

1. •
   (slang, old-fashioned) A hard hit, a knockout or finishing blow, or conclusive argument.

   • He’ll come off as badly as a feller I once hit a sledge hammer lick over the head—a real sogdolloger. — 1831
2. •
   (slang, old-fashioned) Something large or otherwise exceptional; a whopper.

   • Hey, Al, thought I'd call you from the locker room out here at Green Hills. Just made a sockdolager hole in one! A hole in one, Al! (etc.) — 1953
3. •
   (US) A combination of two hooks which close upon each other, by means of a spring, as soon as the fish bites.