duck
n.— «Jemerson also said that Thompkins made black women work longer hours, referring to them as “ducks” because they did not make as much money as white hookers, who were called “swans.” Jemerson, who grew up in Paterson, said sometimes she would work the streets for 18 hours a day while others worked for 12 hours.» —“Woman supplied Galloway hookers” by Madelaine Vitale Press of Atlantic City (Pleasantville, New Jersey) June 10, 2006. (source: Double-Tongued Dictionary)