Green’s Dictionary of Slang

hidey phr.

also heighday, hidy, highdey, i.d.
[SE hi + howdy do phr.]

(Aus.) a general greeting, how are you? how do you do?

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[Aus]Baker Popular Dict. Aus. Sl. 35: Hidey! Highdey!, Hail!, How are you!
[Aus]N. Pulliam I Travelled a Lonely Land (1957) 234/1: hidey! (heighday!, i.d.!) – hello.
[US]D. Jenkins Semi-Tough 197: Burt Danby said, ‘Stud hoss, say hello to a hell of a guy. Put it in the vise with Strooby McMackin, the president of Kentuckian Cigarettes’ I said hidy.