If you're a true playa/pimp/gangsta, you're out on the street busting out the "fo shagginoff" to show you're down with something. It means "for sure", but no way in hell is it the white version of "for sure". All them playas/pimps/gangstas somewhere out west or down south have been using it for centuries; since the beginning of time.
Q: " 'Ey manG, wanna go get some poosy tonigh'? "
A; " Hell yea playa, fo shagginoff "