What does a cold joke mean?

A polar bear was bored one day and began to pluck his hair one by one. It pulled and pulled, and finally pulled out all the hair. Then it said, it's so cold. XD~~ Landlord, this is a cold joke, a joke that is hard to make ordinary people laugh ~ ~ It is actually a joke that is not funny at all, a very boring joke, but it can achieve the purpose of mental relaxation, because this kind of joke is easy to understand. Cold jokes generally go beyond conventional thinking, do not conform to logic and real life, and make people feel dumbfounded. Although some cold jokes are quite interesting, in any case, they don't laugh as much as those who have heard "normal" jokes. Brainstorming is a cold joke. It is said that the word "cold joke" comes from a classic cold joke: one day the little penguin asked his grandmother, "Grandma, am I a penguin?" "Yes, of course you are a penguin." The little penguin asks his father again, "Dad, Dad, am I a penguin?" "Yes, you are a penguin. What's wrong? " "But, but why do I feel so cold?" People will tell this joke: it's so cold; Then slowly, the word "cold joke" came into being. I heard about the origin of the cold joke, but I don't know if it's true.