Those women who, for the sake of distinguishing them from the professionals, I must call amateurs, are generally spoken of as “Dollymops.” Now many servant-maids, nurse-maids who go with children into the Parks, shop girls and milliners who may be met with at the various “dancing academies,” so called, are “Dollymops.” We must separate these latter again from the “Demoiselle de Comptoir,” who is just as much in point of fact a “Dollymop,” because she prostitutes herself for her own pleasure, a few trifling presents or a little money now and then, and not altogether to maintain herself.
Source: wiktionary