expression
expresses incredulity, disbelief, or irony
Kansai and Kyushu dialect sentence-final expression used to show that the speaker finds something hard to believe, ironic, or surprising. Often carries a rhetorical or teasing tone.
そんなことあるかいな。
As if that could happen.
ほんまに来るんかいな。
Are you really coming? (expressing doubt)