Hooroo

[Michiko]

[Hooroo] is a distinctively Australian way of saying “goodbye”.
The truly wondrous fantasmagorically splendiferously magickal word [hooroo] (credited to someones [Uncle Wally]) echoes two likely sources.
Its a bit of a joyous exclamation, as in Hooroo! hooroo!
hooray! (Darby OGill), and its also something of an owls hoot, as in the proper hooroo, hooroo ([The Sword in the Stone]).
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[Agnes]

informal for goodbye