Still not widespread then. Didn't really think it would be, but I've seen it used in a couple of unexpected places and thought it might have caught on.
It's basically the same as 'jailbroken'- that is, capable of running homebrew software- but originating from the PSP as a play on 'Custom firmware'.
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"I'm Commander Shepard, and you're standing in the biggest library in Citadel Space. Look me up."