PK comes from player knockout battles popular on live streaming apps, where two hosts compete for viewer gifts during a timed round. Clips like PK Habis Pertama circulate as short soundboard recordings taken from those sessions and reused far outside the original stream. The phrase marks the end of a first round, which is why creators reach for it at score reveals and rematch teases. Its popularity comes from that specific live context, turning an everyday stream announcement into a reusable marker for wins, losses and competitive banter online.