袖手旁观你和别人打打闹闹
[xiù shŏu páng guān nĭ hé bié rén dă dă nào nào]
It roughly translates into 'watching with folded arms while you have fun with others'. By choosing this Internet nickname, people may suggest that they choose to be silent bystanders and do not intend to actively intervene or involve in certain interpersonal activities, often implying a little bit indifference and loneliness.