The name refers to the Tsar Bomba, the Soviet hydrogen bomb tested in 1961 and widely known as the most powerful nuclear weapon ever detonated. Online, that name has become shorthand for anything enormous, overpowered or unstoppable, and huge explosion sounds attached to it are shared across memes, edits and gaming videos. Because the blast feels instantly recognisable as total destruction, creators keep returning to it whenever they need a single sound that says something has gone completely beyond normal scale.