Air horns began as real signalling devices, using compressed air to make a very loud blast for boats, trucks and sporting events where a voice could not carry. At stadiums the sound became linked with goals and big plays, and that association carried into television, hip hop tracks and online videos. As editing software made sound effects easy to drop in, the blast turned into a shorthand for hype and excess, often layered in rapid bursts for comedy. It remains popular because the meaning is instant, even without any visual context.