Sequal to the PChit multiplayer title Team Fortress Class by Valve. Oringally slated for release in 2001, finally released on October 10, 2007 in the Orange Box along with Half-Life 2 Episode 2 and Portal.
Guy 1: " Dude, I'm so fucking tired."
Guy 2: "What the hell were you doing all night?"
Guy 1: "I was pwnin bitch ass pyros in TF2"
Guy 2: "........"