你是我刻骨铭心的至爱你是我永生难忘的真情
[nĭ shì wŏ kè gú míng xīn de zhì ài nĭ shì wŏ yŏng shēng nán wàng de zhēn qíng]
Translated as 'You Are My Deepest Love, My Unforgettable Passion', this username expresses deep and lasting affection. The owner likely wants to portray feelings that are so intense they're imprinted on their heart forever.