江湖年少
[jiāng hú nián shăo]
It literally means 'Youngster in Jianghu'. In traditional Chinese culture, Jianghu symbolizes a society or world of adventure, heroism, struggle, wanderlust, romance and even gangster-activities outside normal social orders. Using this nickname may mean the person fancies themselves as adventurous and brave like young martial artists or heroes described in classic wuxia novels.