It means for real, it is a part of the izzle dailect, in which you take the first letter and add izzle, in which most are like this. In this case making for into fa and adding sh and then izzle.
It may also be said foshizzle, forshizzle or fashizzle, never is it forizzle.
He is fashizzle.
That Nikhil kid, i'm not shaw if he's fashizzle.