Originates from the central to upper north island of New Zealand. Popular use among native inhabitants has meant this catchy phrase has been passed on through generations of rag tag street fighters.

Large families also use this common phrase when inter-family fighting occurs.
Rangi: You been messing with my cousin?
Michael: Which one?
Observer: He's getting smart, Eh hit em, hit em in the head.
by docterturbo November 11, 2009
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