another way to say for sure.
G: Yo Jellay (look under J for meaning), you tap that beatch last night?
Jellay: Fo sheese.
1.'For Real', or 'To get serious'
2.An exclamation of seriousness, or to say 'this is seroius', or 'I'm serious now'
3.Also to say 'Are you serious?'
'This is fo sheese'
'Are you fo sheese!?'
'OK, now im fo sheese'