The spray sound comes from the Half-Life engine games of the late 1990s and early 2000s, and it is most closely associated with Counter-Strike 1.6, where players could leave a graffiti spray on walls during a match. The feature became a small ritual between rounds, a way to claim a spot or tease an opponent without saying a word. Like bomb has been planted, it survived through clips, edits and soundboards long after the original game faded from daily play, because it instantly signals classic Counter-Strike to longtime players.