This sound comes from Counter-Strike: Global Offensive, Valve's team-based shooter released in 2012, where terrorists plant the C4 bomb at specific sites. The planting cue became familiar far beyond the game through frag movies, highlight edits, and reaction memes centered on pressure and time running out. It is still widely used because the sound immediately tells players that a round has entered its most critical phase, much like the related bomb has been planted voice line used elsewhere in Counter-Strike clips.