Mummitrollet is the Norwegian name for Moomintroll, the gentle main character of Tove Jansson's beloved Moomin stories, which have been adapted into several animated television series dubbed around the world. This short line, translating roughly to 'not normally this hot', comes from the Norwegian dub of the cartoon. Short dubbed cartoon quotes like this one circulate on soundboards because they work as ready-made reactions, and Norwegian users reach for this clip whenever the weather turns unusually warm.