This sound is mainly known online as a brief attention-grabbing effect rather than a widely documented quote from a specific film, show, or game. Short "psst" clips like this spread through meme edits, reposted soundboards, and chat audio shares because they are easy to place before a reveal or reaction. Its staying power comes from how quickly it communicates secrecy, urgency, or a nudge to look closer. It fills a similar editing role to a discord notification or a censor beep, but with a more mischievous tone.