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A combo of Fuck and 1337. Like when you're so 1337 you could kick ass in a video game and still have time to cuss someone out.
I'm not just 1337, I'm F1337. You ain't even close.
This guy is F1337. He beat me in the game and called me a noob.
F1337 is when you know all the cheat codes and still swear at the screen.