What does big brother mean by laughing at second brother?

This sentence is a two-part allegorical saying, which means that the boss laughs at the penis.

This two-part allegorical saying comes from "Laughing in the Woods", and the original text is "Don't laugh, second brother, your whole body is average".

This two-part allegorical saying expresses a derogatory meaning, implying that there is mutual ridicule and derogatory meaning between the boss and the second child. In real life, brothers sometimes have conflicts or laugh at each other for some reasons, but this kind of behavior should not be advocated. Brothers should respect each other, support each other, help each other and tide over difficulties together.