薄情少年浅梦菇凉
[bó qíng shăo nián qiăn mèng gū liáng]
The term '薄情' (bo qing) suggests being callous and inconsiderate, often associated with heartless. '浅梦' means a light dream. '菇凉' is a cute internet slang meaning young girl. Overall, this username conveys the image of a disinterested boy harboring dreams that feel fleeting and unimportant for someone, probably the girl he doesn't take seriously.