Scout is one of the nine playable classes in Valve's Team Fortress 2, a team-based shooter first released in 2007, and this line comes from his in-game taunts and voice responses. Players began clipping his cocky Boston-accented one-liners for kill compilations and funny moments, and the format spread through YouTube edits, Twitch clips and soundboard sites where short TF2 quotes are easy to reuse. It has stayed popular because the insult is short, instantly readable and fits almost any moment when someone overestimates how funny or skilled they were.