What do you mean by hot sausage and cold noodles?

It means warm-hearted, cold-faced, and describes the inner enthusiasm, but the expression is indifferent.

This idiom is mainly used in oral communication to describe those people or behaviors who seem to be enthusiastic on the surface, but in fact they are indifferent, heartless and uncaring for others. This idiom is also very useful to describe some people's attitudes and behaviors at work. For example, some leaders take other people's problems to heart and show great enthusiasm and consideration, but actually ignore them; For example, some "warm-hearted" people in life have no real emotional input and practical actions.

Using this idiom to expose and criticize this kind of behavior is helpful to promote the development of interpersonal relationship and improve work efficiency.