Green’s Dictionary of Slang

(Aus.) on arrival at a house, to ride straight into the stables andleave ones horse before anouncing ones presence at the front door.

1889-90

D. Sladen in Barrère & Leland Sl., Jargon and Cant I 62/1: Back-slanging [...] up the country in Australia [...] it is almost the universal custom for any one of any rank to drive straight into the stables of the house he is going to, call for a groom (or quite as often a boy) to take the horses, and then walk round to the house.