The Double Kill callout comes from Halo: Combat Evolved, released in 2001, where medal announcements became a memorable part of multiplayer matches. Players heard it after getting two kills in quick succession, and the line stuck because of its clear delivery and satisfying timing. Over time, the clip spread beyond Halo into broader gaming edits, compilation videos and meme posts. It is still used because even people who have not played the original game often recognize it as a universal shorthand for a fast two-hit victory.