The title points to the New Super Mario Bros era of side-scrolling platform games, which made bright, bouncy 2D Mario tunes instantly recognisable to a generation of players. This mmmmmm version is not a clean game rip but a fan-style vocal imitation shared on soundboards, where long, silly humming clips are saved for quick reactions. It spread through gaming edits and meme compilations because the tune reference is familiar even without any music, and the drawn-out delivery can turn a short fail or waiting moment into a joke.