Green’s Dictionary of Slang

rattlesnake n.

(Aus.) a promiscuous girl.

S.J. Baker Papers Mitchell Lib. MS 165 Box 4 Bundle 2 File 3 Rattle snake—a fast girl [Simes:DLSS].
[Aus]S.J. Baker Aus. Lang. 123: We have another vocabulary altogether for the harlot and her kind: chromo [...] lowheeel, rattlesnake.