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A word straight from Stephen King: Equivalent to fucking.

Can also be used as in 'fucked up', 'fucker' or 'fucked', which would make 'facked up', 'facker' and 'facked'.

It's awesome when you say it because no one actually knows what it is, so if you're young enough to have nagging parentals but old enough to enjoy cursing, just say it with an extra-hard A, and drag it out: FAAAA-keen
Man, I had a fackin good time last night.

That's one sick mamafacker.
by Interview All The Llamas July 02, 2006