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1.
basically a new way to say "yo". Yo could be considered old since it was used in the 80s and 90s so the new generation decided to invent a newer "yo"
Joey: "Chyo wassup bro?"
Alex: "Chyo im just playin some GTA4"
by B.Rivadeneira September 25, 2008
 
2.
Alternative for "yo". Used commonly by teens, and frequent beach goers.
Chyo man! What's up, dude?!
by Pkok February 13, 2011