Short for Your mum or ya mum or yo mumma
Yo mo is so fat she can't even fit in this joke

Bob: Who you guys talkin about
Everyone: Yo mo,,,,(douche bag)
by Mitchell Locke June 29, 2009
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A Mormon girl with severe camal toe who hangs out in front of the Howard Johnsons across from the "TEMPLE'.
The missionaries had their hands full with all those ho jo mo yo smugglers, so its goodbye Mr. BLUEBALLS tonight for the boys. Good for them.
by craig john November 10, 2006
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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...
by lush.x June 22, 2009
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