The word yo was originally used to indicate possession ex. yo mamma. In modern day yo can be added to sentences which end in a preposition thus correcting poor grammar.
Where's yo mamma at yo?
by Mista Slawta April 04, 2003
What people from Yonkers, NY call Yonkers. DMX, The Lox (Jadakiss, Styles P., Sheik Louch) Mary J., all made the phrase Y.O. famous
Where you from? Im from Y.O.
by MJ 612 December 16, 2008
Another way to say "hello", "hey" or "hi".
"Yo dude. What's up?"
by xoxotilatequilafanxoxo January 28, 2008
Word used before, after, or during a sentence that makes it cooler
Group of hot chicks: Ben, where are you going?
Ben: I got some shit to do ladies, later 'yo.

Sweet, 'yo!

'Yo, I gotta take a shit, yo'
by mister delicious May 25, 2007
Substitution for someone's name.
Ay, Yo, how you doin'?
by S Donahue January 15, 2004
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