Slick  —adj. Colloq. 1 a skilful or efficient. B superficially or pretentiously smooth and dexterous; glib. 2 sleek, smooth. —n. Large patch of oil etc., esp. On the sea. —v. Colloq. 1 (usu. Foll. By back, down) flatten (one's hair etc.). 2 (usu. Foll. By up) make sleek or smart.  slickly adv. Slickness n. [old english]