A client for a prostitute. Also a romantic tryst or meeting between two people who are attracted to each other.
To go out with, socially.
Can be an implied relationship, where one sees another party, regularly for social reasons, usually romantic and/or sexual.
Often used by Hustlers, as a code phrase, to see if the party they are talking to, is interested in their services.
Also a way to supposedly avoid being detected as soliciting from a person, who might be a law enforcement official.