Word has it that "yo" started in South Philadelphia, the Italian area.
However this could be because of the movie Rocky, in which he lives in South Philly and says "yo" a lot.
The real history might be out there, but so far, this is the best guess out there.
97π 57π
Used as "That's a win!" or "That's a score", the yo replacing whichever word signified victory. Often used as a more humerous way of saying "owned" in counter-strike without sounding like a noob.
{TC}Nubler Kreiger: What? I didn't even see him and he shot me!
<LOL>Nice Guy Eddie: Where's the reg?
(BoM)UnknownAtom: That's a yo!
10π 3π
It's what un-educated people say most of the time.
Me: "That Michelle sure does have a nice body!"
Tom: "YO, man, stop talking about my sister!"
256π 168π
a yoyo that doesn't come back.
person1: "hey, let's go beat up some people whose skin tone differs from ours!"
person2: "can do! right after i wind up this yo.."
80π 47π
A greeting, can also mean a Woman friend or associate that isnt intimate which in plural is "Yos"
30π 19π