Perth here. "nah yeah" is common. the "nah" indicates disagreement with the statement, and the "yeah" affirms the positive. Often with a restatement of the sta

Perth here. "nah yeah" is common. the "nah" indicates disagreement with the statement, and the "yeah" affirms the positive. Often with a restatement of the statement attached. e.g: "nah, yeah I like you mate"