What does summer lemon mean?

Express people's envy and jealousy. Summer lemon has different meanings in different contexts. In social networks, eating lemon is a popular way to express people's envy and jealousy. It comes from the story of the fox and the grape in Aesop's Fables, and it uses acid to describe the mentality of wanting but not wanting, envy and jealousy. On the Internet, lemon is often used to describe a sour attitude or mood.