The Oxford Thesaurus An A-Z Dictionary of Synonyms - slicker n.

1) confidence man or woman, cheat, swindler, mountebank, Colloq con man, city slicker: That slicker she met in Paris tricked Harriet out of a lot of money before he disappeared. 2) oilskin (raincoat) : Best wear your slicker if you're going out in this storm, James.