青春花在了賣萌上
[qīng chūn huā zài le mài méng shàng]
The username '青春花在了賣萌上' (Wasting youth on cuteness/acting adorable), refers to the notion that this individual perhaps has chosen a playful and cutesy attitude instead of taking life too seriously in their youth. They may have spent their young years acting cute rather than pursuing more meaningful things that often come associated with maturing into adulthood.