Slicks

noun

1. A covering of liquid, particularly oil.

   "Careful in turn three — there's an oil slick on the road."

2. Someone who is clever and untrustworthy.
3. A tool used to make something smooth or even.
4. A tire with a smooth surface instead of a tread pattern, often used in auto racing.

   "You'll go much faster if you put on slicks."

5. A helicopter.