The line comes from Persona 5, the 2016 role-playing game from Atlus, where Ryuji Sakamoto is one of the main party members and a frequent source of blunt, comic relief. The phrase itself is a much older English idiom meaning that something is finished and there is nothing more to add, which is why it translates so well outside the game. Shared as a short soundboard clip, it has become a handy reaction sound for creators who want a quick, definitive ending without explaining the reference, keeping it useful long after the game's original release.