花姑娘花公子
[huā gū niáng huā gōng zi]
'Flower Maiden and Flower Playboy' refers to a couple who look very stylish and beautiful, similar to blooming flowers; another possible understanding could relate these 'flower youths' specifically to frivolous, fashion-conscious young adults. Depending on context, this could have either positive or light-hearted derogatory connotations.