我当了皇帝就封你当太子
[wŏ dāng le huáng dì jiù fēng nĭ dāng tài zi]
This nickname conveys a sense of close, loyal friendship and even has a hint of humor. It expresses an implication as if the user is telling their friend: "If I were the emperor, I would appoint you as the crown prince." The emperor and crown prince here are symbols from ancient Chinese monarchy system and often used as elements in Chinese dramas or stories, indicating power, trust, or a wish for a good and noble relationship.