Whakapohane
From Wikipedia, the free encyclopedia
Whakapohane is the Māori practice of baring one's buttocks with the intent to offend. It is as offensive in Māori as in Pakeha culture — symbolises the birthing act, and renders the recipient noa ("base").[1]
A famous instance of whakapohane being performed in recent times was Dun Mihaka to the Queen of England in 1981.