女汉子的眼泪是钻石萌妹子的眼泪是水滴
[nǚ hàn zi de yăn lèi shì zuàn shí méng mèi zi de yăn lèi shì shuĭ dī]
Here, '女汉子' (nü hanzi) means a strong woman while '萌妹子' (méng mèizi) describes young, cute girls. This phrase means that tears from a tough girl are like diamonds, rare and precious. On the contrary, tears from a cute girl are just like dew drops, too common or easy to see. It shows the speaker admires independence.