fois, adj. — Green’s Dictionary of Slang

fois adj.

[? Fr. fois, time, i.e. the perceived antiquity of such styles]

(US campus) reminiscent of European style.

1989		Eble Campus Sl. Sept.
1996		Eble Sl. and Sociability 77: Fois /fwa/, from French ‘time, instance’ means ‘reminiscent of European style’: ‘How do you like my fois sweater?’.