Green’s Dictionary of Slang

yabbie n.

[SAusE yabby, a crayfish; the crouching, padded and gauntleted keeper supposedly resembles one]

(Aus.) in cricket, a wicket-keeper.

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[Aus]Hibberd & Hutchinson Barracker’s Bible 235: Yabbie [...] wicket keeper; from the curious stance and gauntlets of the pudgy breed [AND].