fo shizz

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"

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fo shizz up the spout

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.

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slack dogg fo shizz

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