A word used in Upper Michigan, which refers to a knit cap sometimes referred to as a watch cap. It can also refer to any knit caps worn in cool weather. It is a Yooper dialect word which has no correct or standard spelling. Could be spelled chuk. It is from the French Canadian word, toque, which means the same thing. The Quebecois pronunciation is much like chook. The Anglo Canadians pronounce it toke, or took.
It's chilly out, so you better wear your chook.