Green’s Dictionary of Slang

(Aus.) an octopus.

1968		R. Hill Bush Quest 101: There were two buckets of octopus pieces for bait. The ‘ocky’, as they call it, was bluish white and rather slimy looking [AND].
1976		B. Scott Complete Bk Aus. Folk Lore 239: Not that any crayfisherman would refer to an octopus by its right name. An octopus is merely an ocky, more than one are ockies.
1984		Canberra Chronicle 29 Feb. 19/3: Watch out for the ockies that roam all over the sand flats [AND].