In Chinese, it is pronounced as: zuǐ tì，Written as:

“Mouthpiece” is an internet slang term commonly used to describe someone who expresses opinions, viewpoints, or emotions on behalf of another person in specific situations. This is particularly prevalent on social media, live streaming platforms, or video content.
The term “Mouthpiece” was coined by internet users to express gratitude towards those who articulate the collective sentiments of many, often more eloquently than they could themselves. This phrase conveys a sense of comfort and satisfaction when one’s own thoughts are perfectly expressed by someone else.
When someone reads a viewpoint or comment that perfectly resonates with their own feelings, they might call the person or comment their “Mouthpiece”. For example, “What you said is exactly what I wanted to say; you’re truly my Mouthpiece!”