what what does it mean when someone says someone is on their period?
Best Answer: Hi there, When females reach reproductive age they begin having periods as part of their menstrual cycle. When a girl has her period it means that her body has reached the stage in her cycle in which it sheds the lining of her uterus. Once a month the ovaries release an egg which travels to the uterus; the uterus builds up extra lining in preparation for pregnancy.