数学不好的姑娘都是好姑娘
[shù xué bù hăo de gū niáng dōu shì hăo gū niáng]
This name suggests that a girl who is not good at math is a good girl. This might originate from a perception or jest indicating those girls, less bound by logical studies like mathematics, might retain more femininity, innocence, or free-minded nature.