The line comes from StarCraft, Blizzard's long-running real-time strategy series, where the Terran Marine is the basic human infantry unit players send into battle. Voice lines like this became part of the game's personality, quoted by players in matches, streams and fan videos long after the original release. As StarCraft clips spread through gaming communities and soundboards, the short, confident shout survived as a shorthand for charging in. It still works because it is instantly recognisable to strategy fans and needs no context to land.