Air horns were originally signaling devices using compressed air, long associated with boats, trucks and sporting events before they became a staple sound effect. Online, the blast took off during the early 2010s montage parody era, where editors layered it over exaggerated reactions, trick shots and chaotic remixes. That use cemented the air horn as shorthand for hype, disruption and ironic celebration. It remains popular in gaming videos, memes and short-form edits because a single hit instantly signals that something over the top is happening, without needing any dialogue or explanation.