The sound comes from Squid Game, the South Korean survival drama created by Hwang Dong-hyuk and released on Netflix in 2021, where players are eliminated from deadly children's games. The short electronic cue became familiar to millions as the series became a global hit, and clips of it were soon shared on TikTok, YouTube and gaming streams. Creators now use it outside the show as shorthand for being out, losing or failing, because viewers recognise it instantly without needing any explanation of the original scene.