Air horns began as real handheld canister horns used at sporting events, on boats and at graduations to make a very loud signal. Online, the sampled blast became a staple of montage parody culture in the mid 2010s, where the MLG air horn was layered repeatedly over quick scope clips and reaction shots. That exaggerated use turned a practical warning sound into a meme shorthand for hype and irony, and the clean three second version continues to circulate on soundboards and in short edits.