Green’s Dictionary of Slang

(N.Z.) a New Zealander who apes American styles etc.

1993		Dominion (Wellington) 3 Mar. 10: Sometimes the expression ‘Have a nice day’ is a sincere wish... But in New Zealand it sounds forced and odd, like the accent of a Queen Street Yank [DNZE].
2003		McGill Reed Dict. of N.Z. Sl. 166: Queen Street Yank Flashy dresser and probably loud with it, the way WWII American servicemen were perceived walking up this central Auckland street.