1970s slang for an attractive woman. As a term of approbation, "fox" conjures up images of gold chains across hairy chests, shiny polyester shirts, Halston dresses, flashing disco lights, disco balls, disco dancing and disco music.
"Ooh la la, c'est la FOX!"
"Hey, foxy lady!"
"That chick is a fox."
The acme of foxiness, is of course, embodied by Pam Grier, as Foxy Brown.