Green’s Dictionary of Slang

slick n.1

[SE slick, smooth, plausible, glib]

1. [mid-19C] (US campus) an unpopular, unpleasant person.

2. [mid-19C+] (orig. US black) a smart, charming, fashionable, sophisticated person.

3. [1930s+] (US, also slick mag) a glossy, expensive, middle-class magazine [SE slick, i.e. high-quality, glossy paper].

4. [1940s+] a swindler, a hoaxer.

5. [1970s+] as a term of address.