The small amount of fluid that is released every day from a vagina. On a typical day, its purpose is to clean the vagina. The amount and consistency of fluid released varies throughout the month. When a girl or woman is getting close to ovulation, the discharge will be thin and stringy, almost like an egg white; other days it may be cloudy or yellowish. If the discharge is ever greenish or greyish or has a foul or musty smell, it may mean that a girl or woman has an infection and she should make an appointment with a healthcare provider right away.