How do you respond when a boy teases you that you are poisonous?

Generally speaking, it is a joke.

It means that you are like poison, which will kill people.

There is also a meaning that I am willing to know that you are a poison.

You can reply:

I am poisonous. Do you have an antidote? This is just a spoken language, and it is troublesome to explain. I wonder if you will understand it wrong. There are several explanations. Look at it. It's as if you did something very embarrassing and everyone felt very embarrassed. At this time, someone will say that you are poisonous! At this time, it can be understood as helping you out. Sometimes, for example, if you play games with friends, you will not drag down your teammates. At this time, you will also say this sentence, which means that you made a mistake, which is also a euphemism. This sentence is generally a euphemism for blame, which is more subtle and doesn't really mean to blame you. But, sometimes you will say this sentence when you make a serious mistake, which is really strange to you. Whether it is serious or not depends on your own experience. Generally speaking, it is a joke spoken language. Your situation is also a joke. They all think you are very interesting, otherwise people will not ask you to play games later, right? Generally speaking, I think you are cheerful and generous before I say this sentence to you, otherwise others will say it for fear of hurting your self-esteem. I didn't mean that to what you said. Don't think too much. It's just a joke.