Speak without thinking, often joke, and the meaning is not clear. What should I do?

Before you speak, you should calmly observe what others are saying and expressing, instead of just saying and not practicing, which will make others feel that you are so relaxed and do your own thing well. If you don't understand, don't say what they understand, and don't rush to answer. You can say "I mean …" to fill in other people's answers.