菇凉谈情不说爱
[gū liáng tán qíng bù shuō ài]
In Chinese dialects, especially northern dialects, 菇凉(gu1 liang2) refers to young ladies. '谈情不说爱' means engaging in discussions on love matters rather directly stating the feeling of 'love'. So overall the nickname suggests an identity of someone who discusses love affairs with restraint or subtlety instead of expressing love openly.