Fo Sho Mo Fo

"For sure, motherfucker" - said as if you were drunk, and your mouth is full of marbles (or balls). Frequently used by old men to appear young.

For sure mother f***er

For sure mother fucker!

Short for *you for sure, mother f*cker?*
As in, are you telling the truth??
Used by chavs etc.

A short way of asking a simple question -
warning, using it probably won't make you look cool, but quite the opposite -
people may just give you a wierd look and walk away.