A dirty mouth, hanging his head to buy bad meat. What does this sentence mean?

It refers to talking or chatting constantly when buying food, rather than concentrating on choosing goods. Hanging up refers to talking or chatting constantly when buying food, rather than concentrating on choosing goods. This behavior will not only affect other customers' shopping experience, but also lead them to choose bad food. Bad meat refers to spoiled or expired meat products, which will cause serious harm to human health after eating.