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...