To languagehat, who managed to track this one down for me:

In reply to:


Used orally from the 1970s but the first written citation we have is
1988. It could have originated from a corrupted form of pakaru (Maori)
meaning broken or ruined.

Dianne B

Dr Dianne Bardsley
Manager/Lexicographer
New Zealand Dictionary Centre
Victoria University of Wellington
PO Box 600
Wellington NZ