The line comes from Valve's Counter-Strike series, where an automated announcer updates both teams on the bomb objective in the classic defusal mode. It is the counterpart to bomb has been planted, heard earlier in the round when the Terrorists set the charge. Clips of the voice lines spread through early gaming videos, forums and soundboards alongside other calls like Enemy Spotted, and they became shorthand outside the game. Players still use the defused line today to mark a successful save, a finished task or a crisis quietly resolved.