菇凉莫拿真钞换贞操
[gū liáng mò ná zhēn chāo huàn zhēn cāo]
This is often used as a light-hearted warning towards naive and young individuals. It has a somewhat mocking tone but also carries advice: girls shouldn't lose themselves and their dignity due to temporary temptation. The word for 'girl' here (菇凉) is an intentional typo from 谷(山山谷谷，gǔ)凉(fresh)，creating a humorous and casual feeling.