在你伤心落泪心碎了的时候有一个会陪着你的人叫闺蜜
[zài nĭ shāng xīn luò lèi xīn suì le de shí hòu yŏu yī gè huì péi zhe nĭ de rén jiào guī mì]
It describes a close female friendship, suggesting that when you are sad and even heartbroken, there is always a best friend who stays with you. The term 'female friends (闺密, Guimi)' in China indicates a very intimate female relationship that surpasses ordinary friendship but may not imply romance or any sexual relationships. They share secrets and comfort each other when in difficulty.