别像条狗在我背后汪汪叫
[bié xiàng tiáo gŏu zài wŏ bèi hòu wāng wāng jiào]
Literally translated as “Don’t bark like a dog behind me”, it expresses dissatisfaction with someone constantly complaining or speaking ill about them when not directly facing the person; the behavior is likened to a barking dog.