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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means definitely pregnant...seen in the new box office hit "Juno"
...In the flim, Juno says "this isn't a food baby i am fo shizz up the spout.
by D.J. III February 1, 2008
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Origin: Old Ghettish
A word used by lads to say that something is unfair.
Lad 1: I lost 60 cents from the World Stock Market Crash.

Lad 2: Life is so slack dogg fo shizz
by Jack De March 2, 2009
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