slick

A covering of liquid, particularly oil.

(by extension, hydrodynamics, US, dated) A rapidly-expanding ring of dark water, resembling an oil slick, around the site of a large underwater explosion at shallow depth, marking the progress through the water of the shock wave generated by the explosion.

Someone who is clever and untrustworthy.

A tool used to make something smooth or even.

(sports, automotive) A tire with a smooth surface instead of a tread pattern, often used in auto racing.

(US, military slang) A helicopter.

(printing) A camera-ready image to be used by a printer. The "slick" is photographed to produce a negative image which is then used to burn a positive offset plate or other printing device.

A wide paring chisel used in joinery.

(fandom slang) In omegaverse fiction, the copious, lubricating bodily fluid produced by an omega in heat.