好姑娘漂亮温柔好少年帅气体贴
[hăo gū niáng piāo liàng wēn róu hăo shăo nián shuài qì tĭ tiē]
It can be translated into English directly: 'The good girl is beautiful and gentle; the good boy is handsome, generous and thoughtful'. From this nickname, we get the idea of perfect matchings between people. There's admiration within for these desirable traits in young individuals and possibly also contains aspiration for ideal qualities found in others.