This sound is associated with Left 4 Dead 2, Valve's co-op zombie shooter released in 2009. Players recognize it as part of the audio language around horde events, so it became useful well beyond normal gameplay clips. On YouTube, TikTok and short gaming edits, creators use it as shorthand for sudden pressure, swarming enemies or a situation spiraling fast. Its popularity lasts because the cue is brief, instantly readable to gamers and easy to drop before a punchline or fail.