Killer Fish from San Diego circulates online as a short meme sound rather than as a clip tied to a documented film, show or viral moment, so its appeal comes from its title and comedic setup. Creators reuse it because the phrase alone paints a vivid, ridiculous picture, and the sound works as a quick punchline for fish, sea and beach content. It is most often found on meme soundboards, where short, easily recognisable clips are collected for edits, reactions and pranks, and it stays useful because the joke is simple, visual and easy to drop into any aquatic scene.