Green’s Dictionary of Slang

jackery n.

[jackaroo n. (3)]

(Aus.) a popular station-hand; usu. in pl.

[Aus]H. Nisbet ‘Bail Up!’ 123: The Jackeries, i.e. favored station hands, cursed him. [Ibid.] 141: Policemen, stock-riders, Jackeries, the maid-servants.