Tik Tok's "flipping dumpling skin" refers to describing a person who is capricious and unstable, tossing and turning like a dumpling skin. This statement comes from Bao jiaozi's actions. If you want to wrap many layers of dumpling skin, you need to turn it over repeatedly. So it is used to describe a person's unstable personality.
This expression is usually used to describe people who had a good attitude before, but suddenly changed their attitude or behavior. They may show different attitudes and behaviors when facing different people or situations, which makes people feel that they are unreliable or unpredictable.