In Maori mythology, Taniwha are beings that live in deep pools in rivers, dark caves, or in the sea, especially in places with dangerous currents or deceptive breakers. Some can tunnel through the earth, uprooting trees in the process. Some taniwha are credited with creating harbours by carving out a channel to the ocean
The taniwha said you can't build that motorway until you've paid me enough money and the mps agreed.
by Jafa Colin October 27, 2006
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An evil monster - Taniwha is the te reo word for "Monster", and demons are evil.

An informal name for naughty children.
What's Nikki up to tonight?

She's gotta stay at home, the taniwha demons were suspended at school today.
by Mycho July 13, 2022
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