What is Bf40k?
Short for Battlefield 40K, a mod for Battlefield 1942 based on Warhammer 40K, a table top game.
Guy 1: Wow, have you seen bf40k? It is made by teh 1337 HaXX0rz!
Guy 2: Sounds like the shit! What's the website?
Guy 1: Battlefield40k, n00b!