浮沉乱
[fú chén luàn]
This username can be translated into 'ups and downs in chaos'. People choose this because they feel there are lots of ups and downs in life but they are all mixed up and in chaos which makes everything become disorderly. They use this name trying to say that things have changed dramatically or unpredictably in the past period, like floating and sinking unsteadily and aimlessly.