Entry 2 senses · 2 variants Webster, 1913 Slicker /slĭk'-ẽr/ · Slick·er · IPA /ˈslɪkɚ/ n. n. 01 n. That which makes smooth or sleek. 1. That which makes smooth or sleek.(Founding) 02 n. A waterproof coat. 1. A waterproof coat.[Western U.S.]