Slang reference to someone who is the protector, and lover, of a Prostitute or group of Prostitutes.
This a general slang term, that refers to a person who is the husband of a Prostitute, their Lover, or their Pimp.
Generally it refers to the manager or pimp or protector for a prostitute.
It does not mean that they are all of the above, but can be a lover and pimp, or protector only, the one who goes with the girl to an appointment, and waits around, to insure there is no trouble.
They can be the one who looks after the needs of the working girl, such as cloths, bail, and so on.