Green’s Dictionary of Slang

banging-shop n.

[bang v.1 (2a) + SE shop; note synon. US milit. jargon bang house]

(US) a brothel.

[US] (ref. to late 19C) N. Kimball Amer. Madam (1981) 107: A banging shop life is as dull as a sailor’s [...] most of the time.