Ko wai - Te Aka Māori Dictionary

(ko) wai ka hua, (ko) wai ka tohu

1. who can know, who can say - an idiom to imply that it is nigh impossible to know.

Ka mao mai anō ātahirā? Wai ka hua, wai ka tohu? / Will it be fine again the day after next? Who can say?

1. who else? - this idiom indicates that the answer to the question is obvious.

Mā wai tā tātou manuhiri e whakatau? Mā wai atu hoki? Mā Te Wharehuia. / Who will welcome our visitors? Who else but Wharehuia.

1. who the hell are you? - an idiom questioning someone's right of involvement or opinion.

(Te Kōhure Textbook (Ed. 2): 126-127;)

Ko wai hoki ia ki te whakahē mai i aku tuhinga? / Who the hell is she to criticise my writing?

1. who else?.

1. who would’ve thought?.

Ko wai i hua ai ka toa a Tānapu? / Who would have thought Trump would win?