Green’s Dictionary of Slang

a prostitute; thus as adj. promiscuous.

1699		N. Ward London Spy VII 174: A couple of most Tolerable Punks, whose Silken Temptations, and more Modest Deportment, gave them a Just Title to a higher price than the White-Apron Bangtails, who were sweating in the crowd.
1713		N. Ward Poetical Entertainer V 13: Madam Bangtail with a Face of Brass, Rig’d by some Bawd, does for a Beauty pass.
1983		R. Klein Jailhouse Jargon and Street Sl. [unpub. ms.].
1989		K. Dunn Geek Love 335: The ‘bang-tail’ is Miranda [...] flirting with her Binewski eyes.
2005		M.B. ‘Chopper’ Read Chopper 4 205: We run out and try to find the biggest bangtail bleached blond moll in town.