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Common in custom firmware in PSP systems. It is uber 1337. Basically. You know its like the chuck norris of psp crap.
Jake: Man, this new firmware 3.80 M33-5 is 1337!
Mike: Dude, i just bricked ur psp. Sorry bro.
Jake: (shoots self with 12 gauge.)
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Words related to M33

1337 chuck norris firmware leet psp