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much like "for real", showing you are serious about something with a little less seriousness.
"So you're serious? Green Day's on tour again?"

"Dude, i am fo shizz"
by littleorphanpunk February 11, 2008
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Short form of the jive word "foshizzle," or white colloquialism "forshizzle," which both mean "for sure."
Dudette: Do you want to go to the free concert?

Dude: Foshizz 'lil mizz!
by ingaling April 09, 2011
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