Used to describe something that is very cold. Mostly used to talk about the weather, but can also be used to talk about anything that is very cold. It is a variation of the word "froid", which means cold. But, since Québec and Canada are very up north, "froid" was not cold enough, hence came another level of cold: "frette".
This expression can be transformed in other expressions, like "tite frette", which translates to "a cold one", meaning a beer.
"Wow, il fait tellement froid ici." "Il fait pas froid, il fait frette."
"Wow, c'est vraiment de l'eau frette."
"Wow, it is so cold here." "It is not cold, it is frette."
"Wow, this is really frette water."