白骨黄土守你百岁无忧
[bái gú huáng tŭ shŏu nĭ băi suì wú yōu]
This poetic username means 'I will protect you from worry until a hundred years pass using my bones and the yellow earth.' It's a romantic, almost fantastical sentiment of undying love and guardianship, willing to wait and keep a loved one safe for a very long time even beyond death.