Borborygmi refers to the rumbling or gurgling sounds produced by the movement of gas and fluid in the intestines. This natural phenomenon often occurs when the stomach is empty or during digestion, and it can be heard without the use of any special equipment. These sounds are a normal part of the digestive process and can vary in intensity. While often associated with hunger, borborygmi can also happen after eating, especially if the meal is rich in fiber or fat, which can stimulate intestinal activity.