This joke is cold. What does "cold" mean here?

Cold jokes are popular in recent years, which are very practical and traditional (hot? ) Jokes and humor are different.

The traditional joke is to make you laugh when you listen, and the atmosphere is warm; Humor may not be funny at first, but the more you ponder, the more interesting it becomes. There is also "black humor", which is often political satire, which is different from "cold jokes".

The real "cold joke" sounds a bit funny at first, but it is often quite cruel, which makes people want to laugh but can't. Even if you laugh, it is puzzling. This is a subtle feeling, which is difficult to express accurately.

Personally, it is also a subversion and deconstruction of tradition by "postmodernism".