Team Fortress 2 launched in 2007 as Valve's class based team shooter, with the fast talking Scout voiced by Nathan Vetterlein. The Spy is the enemy class built around disguises, invisibility and instant backstab kills, so an enemy spotted callout is always urgent for the team. Lines about catching the Spy became shorthand in the community for that paranoia, and short voice clips spread through forums, YouTube edits and soundboards. The quote stays popular because any game with a hidden traitor or impostor makes the same joke instantly understandable.
About this sound
The TF2 Scout shouting we got the spy in Team Fortress 2, a fast one second voice line used for callouts, spy reveals and gaming memes online.
This is a one second voice line from the Scout in Team Fortress 2 announcing that his team has caught the enemy Spy. Delivered in his loud, cocky Boston accent, the shout is quick, triumphant and a little smug, like a player who finally stopped getting backstabbed. The energy is pure relief mixed with bragging, which is why it lands so well as a reaction. It works instantly in gameplay edits because viewers recognise the panic around a Spy and the satisfaction of exposing him before he can sap a sentry or stab again.