This sound comes from Apex Legends, the free-to-play battle royale released by Respawn Entertainment in 2019. Players know it as the in-game cue tied to being knocked down, which made it easy to reuse in montages and short-form edits. As Apex clips spread on YouTube, TikTok and Discord, the sound became a handy shorthand for losing a fight or throwing an advantage. It still gets used because it is short, clear and immediately familiar to battle royale players.