interjection
You're kidding!; No way!
Osaka-ben interjection expressing disbelief or surprise, equivalent to standard Japanese うそでしょ or うそだ. Casual and often used among friends.
See also: 嘘
A: 明日から海外旅行に行くねん。 B: うそやん!
A: I'm going on an overseas trip from tomorrow. B: You're kidding!
うそやん、そんなことあるわけないやろ。
No way, that can't be true.