Mythical river in New Zealand, used for a location of something or someone whose location is unknown to the speaker, or where time is being wasted.
Mispronunciation of the Maori name of Puhwhai, a meandering and swampy river in Northland.
B."Up the boowai somewher, I guess."
Richard:"I'm back, dear!"
Judy:"From the boowai, I suppose, not doing anything useful!"