Wiktionary
n. (context chiefly derogatory English) A slick person.
Usage examples of "slickster".
They made a big mistake when they picked as their spokesman a political operative, a slickster who did them a disservice with the decisions he made on their behalf.
He declined the port that was served with dessert, even though the Slickster insisted it was vintage, which he seemed to think should make a difference.
She may actually learn something, and in the meantime we can move on to the next case so we can finish this fucking session before Christmas, which, come to think of it, happens to be the time of year when I get to hear from all my law school buddies who went on to become defense attorneys like this slickster named Randall standing next to me and receive those big holiday bonuses that on top of their regular salaries make my compensation look like the pathetic, paltry sum that it is.
Five were wearing the thick-soled tasseled loafers favored by country slicksters who have made it to Washington.