Green’s Dictionary of Slang

cab n.3

[? SE cabin or cabal, a group that associates secretly and, by implication, for illegal or subversive activities]

a brothel.

[UK]Lex. Balatronicum n.p.: Cab. A brothel. Mother: how many tails have you in your cab? how many girls have you in your bawdy house?
[UK]Egan Grose’s Classical Dict. of the Vulgar Tongue.
[US]Trumble Sl. Dict. (1890).
[Aus]Crowe Aus. Sl. Dict. 14: Cab, a house of ill-fame.
[Aus] (ref. to 1890s) ‘Gloss. of Larrikin Terms’ in J. Murray Larrikins 202: cab: a brothel cab moll: a low woman.
[Aus]G. Seal Lingo 45: A cab and drum were terms for a brothel – cab molls, or just molls were those who worked in them.

In compounds

In phrases

cab it (v.)

to visit a brothel; to have sex with a prostitute.

[Aus]Bell’s Life in Sydney 13 Feb. 3/5: [She] said they [i.e. banknotes] had been entrusted to her for safe keeping by the prisoner, while he was taking his pleasure ‘cabbing it’ .