It's HAKA not hakka. Doubled consonants are impossible in Maori.

I have heard an explanation of the origin of the dance from somebody who ought to have known (a New Zealand anthropologist, I think). Seems that Maori warriors went into battle stark naked, and the dance was to give them all hard-ons at the thought of bashing their enemies' brains out. If anybody in the squad couldn't get it up they'd call the attack off.

The guys who want morris to be men-only haven't gone *nearly* far enough.