Lucio is the Brazilian DJ and support hero in Overwatch, Blizzard's team-based hero shooter first released in 2016, and this short line comes from his in-game voice lines. Players and fans began sharing his upbeat quips on soundboards and in short clips, where the mic-check wording made it easy to reuse outside matches. It has stayed popular because it is instantly recognisable to Overwatch players, needs no explanation, and works as a quick, friendly opener for videos, streams, and reaction edits.