Green’s Dictionary of Slang

1. (US tramp) used of places or individuals considered unfriendly (often aggressively so) to hobos.

1915		Morn. Tulsa Dly World (OK) 13 June 19/2: Hostile — Referred to towns or police that are brutal and mean to hobos.
1923		‘Gila Monster Route’ in N. Anderson Hobo 195: He thought of the time he lost his pal / In the hostile berg of Stockton, Cal.
1926		J. Black You Can’t Win 69: Better wait till night if you want to make a train. The railroad bull is hostile.
1937		‘Boxcar Bertha’ Sister of the Road (1975) 33: The shacks are hostile, and the railroad dicks will glom you sure, unless you’re lucky.

2. (Aus.) to become angry (with).

1941		K. Tennant Battlers 90: They won’t stick together [...] scared a John ’ud go hostile on them.
1988		McGill Dict. of Kiwi Sl. 51/1: go hostile act angrily; eg ‘If he says one more word to her, I’ll really go hostile.’.
2003		McGill Reed Dict. of N.Z. Sl. [as cit. 1988].