What is "yurlungur"

In Australian Aboriginal mythology (specifically: Murngin), Yurlungur is a copper snake who was awakened from a deep sleep by the odor of a woman's menstrual blood. The woman and her sisters, the Wawalag, were eaten by Yurlungur, who was told at a later snake meeting to regurgitate the women. In Australian Aborigine ceremonies, the vomiting symbolizes boys entering manhood.