This sound is associated with Sans from Undertale, the 2015 indie RPG created by Toby Fox. Online, people often use these short dialogue bleeps as shorthand for a character cameo or an instantly recognizable Undertale joke. Sans became one of the game's most quoted and remixed characters, so even tiny audio snippets tied to him spread through meme edits, game compilations, and fan videos. The clip stays popular because it is extremely short, easy to place in fast edits, and recognizable to fans within a fraction of a second.