[ianlanterman] for the observation that a "cooly" (French "coulee") is a geographical feature common in the Alberta area (there is a Devil's Coulee, an East Coulee, and others, in Alberta). It is a kind of arroyo or gully, so the title might refer to it becoming frozen in winter. Other possibilities: [DC] is fairly sure that a cooly is a sort of drink; hence, a cooly with ice in it, though this is not confirmed.