A way of saying for sure with more attitude. It can be used to agree with something or tell someone you agree, while sounding more smooth than saying for sure.
"We blazin tonight?" - "Sha fo bro I got shit to do today, smoke."
"Damn that bitch was fine." - "O SHA FO, I'd tap that cud."
Sha'darriel is the girl that everyone would kill to be. Super pretty, smart, honest, nice,has a pretty shape, and very cool. She's your basic over-achiever and one of the best friends you'll ever know.