一个满口草泥马的好菇凉
[yī gè măn kŏu căo ní mă de hăo gū liáng]
The term uses colloquial internet slang where '草泥马' (Cao Ni Ma) is an expletive. The phrase tries to convey an attitude of frustration or annoyance, but it ends with '好菇凉', implying 'a nice girl'. There seems to be some ironic contrast being used here, indicating someone who appears tough but has a kind heart.