满嘴草泥马的都是好菇凉
[măn zuĭ căo ní mă de dōu shì hăo gū liáng]
The phrase uses a provocative and rather coarse expression mixed with an affectionate term for girls. 'Cao Ni Ma' is a vulgar term while 'hao gu liang' means nice girls or good people. It implies that the person can be direct but still has a good nature deep down, often used in a humorous context.