我以为我们姐妹情谊深似海我以为我们日久生情不分离
[wŏ yĭ wéi wŏ men jiĕ mèi qíng yì shēn sì hăi wŏ yĭ wéi wŏ men rì jiŭ shēng qíng bù fēn lí]
It expresses disappointment about friendship (possibly between women), feeling like the once close, inseparable friendship gradually turned cold. The nickname reflects changes in relationships, and how people feel hurt or lost when they see good friendships deteriorate.