Who can explain to me what "cold joke" means? Why are others "cold"?

In English, this is called a bad joke or a cold joke.

Definition: 1: It means that this person is quite calm and basically expressionless. After listening to it, the listener should be stunned and think about it before he feels funny.

Definition 2: 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 funny, they will not laugh like those who listen to "normal" jokes anyway; A joke that is not funny at all, a boring joke, can achieve the purpose of mental relaxation, because such jokes are not easy to understand; Brainstorming is a cold joke. Especially idioms borrowed from homophones and English, as well as puzzles such as peanuts and recent flowers.

Definition 3: Cold jokes are actually jokes that are not funny at all. They are boring jokes, but they can achieve the purpose of mental relaxation, because they are easy to understand without thinking, but they can have a long aftertaste.

Definition 4: Cold jokes refer to jokes that make people feel different from ordinary jokes and are difficult to laugh because of homophonic words, translation, subject ellipsis, logic, judgment, special content and other reasons, or because of the performer's tone or expression. A cold joke doesn't mean it's not funny, it's also a manifestation of humor. Sometimes a cold joke is not funny, which is also one of the jokes.

Definition 5: Cold jokes (Hong Kong is called bad gag, Taiwan Province is called bad stem) are a kind of failed jokes. It means that the original funny joke can't achieve the funny purpose and it's hard to make people laugh, but it doesn't mean that the joke itself is boring because of homophonic words, translation, subject omission, different logic, special judgment and content, or because of the performer's tone or expression. Nowadays, most people laugh when they hear cold jokes, and sometimes they make a gesture of hugging their arms: "It's so cold!" " Or words and expressions related to cold semantics, such as chills, temperature, air conditioning or hot weather.