Green’s Dictionary of Slang

(N.Z.) a pinball machine; thus pinnie joint, an amusement arcade.

1986		T. Winton That Eye, The Sky 33: Malcolm Musworth is playing pinnies with the machine. Ibid.] 35: The clatter and ring of the pinny machine.
1994		North and South (Auckland) Apr. 51: Her other son was out playing pinnies in Newlands Mall [DNZE].
2007		D. McDonald Luck in the Greater West (2008) 105: Hanging out after school at the pinnie joint.
2010		P. Docker Someone Else’s Country 378: I’m goin to look for Lloyd. He’s in the pinny joint.
2017		T. Spicer Good Girl Stripped Bare 105: Mum scored the pinnie from the owner of a house she was selling.