1. A term for an attack doing either double damage, or significantly more damage than usual. Taken from the game manuals and guides of countless RPGs, including but not limited to Pokemon and Dungeons & Dragons, and anything themed after D&D, etc.
Sweet, my near-dead-Machamp's/Fighter's Revenge/Cleave attack scored a critical hit on that Tyrrannitar-with-poor-defense/weak Kobold!!!PWN!!!!11!