我许你一世流年我给你一生心愿
[wŏ xŭ nĭ yī shì liú nián wŏ jĭ nĭ yī shēng xīn yuàn]
'I give you one wish that we can grow old together.' This implies a kind of love promise, perhaps the owner of this nickname cherishes his lover and longs for a beautiful ending between the two.