新酒已陈
[xīn jiŭ yĭ chén]
"New Wine Has Become Old", this kind of online nickname implies a certain sentiment. It is like a metaphor - new opportunities (wine) are missed or not valued at all so they become old things (wines turning bad). Or you may think it's referring to the fact that even if we have new beginnings/new things, sometimes our mentality and situation can turn these changes or new situations stale before time. It represents a melancholy tone and regret for past opportunities.