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Iyah is Oh My God in chinese. Normaly used when somthin really strange has happened
Person 1: Look over there, is that Britney Spears?
Person 2: IYAH!!!
by smilyface1001 April 03, 2009
An expression used by chinese to mean: Oh my! An expression of surprise.
Fiona: "I yah! I am driving a car I yah!"
by Chinkalicious July 15, 2009