正儿八经的好青年吊儿郎当的好姑娘
[zhèng ér bā jīng de hăo qīng nián diào ér láng dāng de hăo gū niáng]
A well-behaved good young man paired with a carefree and unconventional good girl. This juxtaposition suggests contrasting personalities between the user and perhaps a partner or acquaintance.