Full Cowling is a technique used by Izuku Midoriya, the protagonist of My Hero Academia, who inherits the One For All quirk and learns to spread its power evenly through his body instead of concentrating it in one limb. The result is a controlled, full-body aura of green lightning that lets him move and fight at much higher speed and strength. Online, the charge-up sound has become shorthand for that transformation, and creators reuse it in edits, memes and hype compilations whenever a character or player is about to unleash their full power.