Reverse-hippie for 'far out man' - in the same context that good is bad.
'Far out man' reaches the edge of the known universe - 'far in man' reaches the edge of your known innerspace
1st dude - "That shit is sooo strong i'm tripping"
2nd dude - "Yea, far in man"
by street smeg May 8, 2005
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fellow #1: hey, dude, we just got tickets for the Allman Brothers Band this Friday!

fellow #2: Far out man! (really should be a comma after out, so it would be: Far out, man!)
by rocket1air November 14, 2013
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