记着我们一辈子的姐妹知道我们一辈子的闺蜜
[jì zhe wŏ men yī bèi zi de jiĕ mèi zhī dào wŏ men yī bèi zi de guī mì]
This nickname highlights a deep bond between two lifelong friends. The term 'sisters in spirit' signifies a friendship so close it resembles familial ties, indicating loyalty and everlasting companionship.