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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:, n00b!
by Hawk January 07, 2005
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