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.
Guy 1 - So I totalllly got with this well hot girl last night!
Guy 2 - Woah! Yo
fo sho mo fo?!
Guy 1 - What?!
Guy 2 - Are you fo sho -
mo fo?!
You're kidding?
Guy - Okay, so i'm going now...