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1.
A term used when any object in question has obvious agreeable properties. Found in 'Wayne's World.'
That girl is very beautiful.

"Well, Chyah"
by Jeremy & Ashlee July 27, 2004
 
2.
Basically, saying in agreement, or another word for, "yeah"
emokid1: wtf mate thats so geh
emokid2: chyah it is.
by Annie December 04, 2004
 
3.
to agree; positive response; like saying 'yeah' or 'yes'
PERSON 1: "Want some icecream?"

PERSON 2: "Chyahs i do!"
by Uh-0h 0re0 June 25, 2009