A hustler was a person who was quite deceitful and successful in playing a game.
Mardah called Jake a hustler regarding his skills at dom-jot much to the confusion of his father. (DS9: "The Abandoned")
While inhabiting Odo, Curzon Dax saw a Ferengi Tongo hustler in Quark's and told Jadzia he would make him out. (DS9: "Facets")
Tom Paris told Harry Kim that the pool table at Chez Sandríne in Marseilles attracted the world's greatest pool hustlers. (VOY: "The Cloud")