Green’s Dictionary of Slang

(N.Z.) used as a farewell excl., esp. to someone one dislikes or has just been insulting.

1951		C. Gordon postcard 17 May ‘Feilding Freezing Works’ terms in DNZE (1998) 359/1: When the whistle goes there are cries of Hooray fuck!
1988		McGill Dict. of Kiwi Sl. 58/1: hooray fuck! WW2 army exclamation, modified to hooray f-f-forget it, undoubtedly unmodified again at news of war’s end.
2003		McGill Reed Dict. of N.Z. Sl. [as cit. 1988].