The oof is the classic death sound from Roblox, the online game platform where players build and play user-created worlds. For years every player heard it when their avatar was eliminated, which made it instantly familiar to millions of younger players. Clips, remixes and reaction videos spread it far beyond the game on YouTube and TikTok, turning a simple grunt into a meme for failure. It remains popular because it is short, funny and immediately understood, even after Roblox later changed its in-game death sound.