The sound comes from the bell in Taco Bell's logo and advertising, where a short chime has introduced the American fast food chain's commercials for decades. Online, creators isolated the toll, lowered its pitch and shared it as the Taco Bell dong or bong on soundboards and short video platforms. Its recognisable brand link makes an ordinary clip feel like an official advert, which helped it spread as a reaction effect. It remains popular because one toll can turn any reveal into a punchline.