What does it mean to say that a person is cheap?

There seems to be no exact and appropriate explanation for this, because I think the word itself should be a definition.

In fact, you don't need to know what he really means. You just need to understand it. Generally speaking, saying things are "cheap" is similar to "looking for trouble". To put it bluntly from a psychological point of view, when you see something, you will feel rejected.

For example, when a person is doing something ridiculous, stupid and idiotic, you can say that he is a bitch. Of course, from the point of view of this "bitch", he may think that what he did is right and you are wrong, so he thinks you are a "bitch". Of course, some people's behavior is publicly regarded as a "bitch", and there is no doubt that this guy is an absolute "bitch"