This line comes from League of Legends, where the game announcer reports when a player disconnects from the match. As clips from the game spread on YouTube, Twitch and short-form meme edits, the phrase became a handy reaction sound for any kind of sudden exit or abandonment. It remains popular because the wording is formal, the delivery is memorable, and the meaning is obvious even to people who have never played League. It often appears alongside other recognizable game announcer clips such as Enemy Spotted.