The laugh comes from Team Fortress 2, Valve's team-based shooter released in 2007, where the Sniper is the long-range Australian marksman class. Like other character voice lines, it could be triggered in game and was quickly clipped by players for videos, montages and reaction edits. Its wheezy, half-mocking tone made it a natural fit for TF2 memes, and later for broader gaming content where a short laugh says more than commentary. It survives because it is instantly recognisable to TF2 fans while still working for viewers who have never played the game.