The line comes from Overwatch, Blizzard's team shooter released in 2016, where gunslinger Cassidy, originally named McCree, shouts it when activating his Deadeye ultimate before locking onto enemies. Because the callout warns opponents and builds tension before a multi-kill, it quickly became one of the game's most quoted lines. Clips and edits spread it beyond Overwatch players, and creators now use it as shorthand for any high-stakes standoff, duel or decisive moment.