Slick: noun. A substance applied, usually by spray, to one’s Frisbee to reduce the friction between the Frisbee and one’s finger nail. Usually a silicon based spray. Ex. I have a disc, do you have any slick?
Slick rag: noun. The nastiest old rag from the back of the closet, usually a sock, used to rub slick into the disc. Ex. Shoot, I forgot my slick rag again.