Green’s Dictionary of Slang

(Aus.) a camel.

1918		Kia Ora Coo-ee 15 Apr. 4/1: Riding a ‘hooshter’ or riding a horse, / We’re one and the same in the line. [Ibid.] 4/2: Anyone know a cure for a jibbing camel? […] My ‘hooshta’ goes on strike at regular intervals.
1918		Kia Ora Coo-ee 15 June 19/1: Visions of a long spell in Cairo while training to ride the ‘hooshters’ loomed before me.
1946		K.S. Prichard Roaring Nineties 185: ‘We’ll shift ’em,’ Dinny said. ‘It’s ‘Hooshta!’ for the ’Ghans, eh Dinny?’ Frisco laughed.