1. mod. clever; glib. His talk is slick, but his action is zotz.
2. mod. excellent. That is a slick idea.
3. n. a high-quality magazine printed on slick [coated] paper. The slicks are all carrying ads for products and services that couldn’t even be mentioned a few years ago.
4. n. a racing tire. (Auto racing.) That set of wheels has slicks. I wonder why.