"ちゃう"　is used as a Kansai dialect meaning "違う（ちがう）”。 Other than that, "ちゃう" is used as an informal feminine word. ex. あきれる　＝　あきれちゃう　　泣く　＝　ないちゃう　　笑う　＝　わらっちゃう

Yes, this is true in the Kansai (関西) dialect.