Defend the Train is a cooperative wave defense game on Roblox where players protect a moving train from enemies between stations. As clips from the game spread on TikTok and YouTube, its elimination cue became known simply as the DTT death sound, separate from the gameplay itself. Players started dropping it over other games and real life fails, the same way a vine boom or a Fortnite death sound signals an instant loss. Its short length and heavy hit made it easy to reuse in memes, compilations, and soundboards.