The phrase target spotted comes from military and tactical shooter vocabulary, where spotters report a sighting over radio in as few words as possible. Online, the clipped callout escaped that context and became a reusable reaction for any moment of discovery. Short video editors and streamers use it over gameplay clips, security camera parodies and everyday sightings, relying on its instantly readable meaning. Because it needs no setup and lasts only two seconds, it fits memes, compilations and soundboard use without slowing the joke or scene down.