n. — euphemism, dated, Urban culture
an establishment offering massage services and often, illegally, sexual services.
Type: 5. Frequency — These establishments, often found in run-down districts, are associated with illicit sexual services (see. e.g., the 2013 quotation). The term is very rarely found outside of Canada (see Chart 1), and appears to be Canadian in origin. Even with the spelling of "parlor", more common in the US, the term is most frequent in Canada (see Chart 2).
See also COD-2, s.v. "body-rub parlour", which is marked "Cdn".
Images:

Chart 1: Internet Domain Search, 9 Oct. 2013 
Chart 2: Internet Domain Search, 9 Oct. 2013