Green’s Dictionary of Slang

Bullock’s Kidney n.

(Aus.) Sydney.

1930		Narromine News & Trangie Advocate (NSW) 3 Jan. 9/1: Mr. W. Wigglesworth, senr., of the Western Stores staff, is now on holidays, and is somewhere enjoying himself in the Bullock’s Kidney.
1935		Williamstown Chron. (Vic.) 13 Apr. 1/5: He gave out five winners, two in Vic., [...] and three in the bullock’s kidney.
1941		Williamstown Chron. (Vic.) 3 May 6/2: Prior to them leaving ‘Bullock’s Kidney’ (Sydney) I received a message.