干妈 is a culturally specific term for a woman who is not your biological mother but is recognized as a godmother or honorary aunt through a formal or informal kinship ritual. This relationship is common in Chinese communities, where a child's parents may ask a close friend or relative to become the child's 干妈, creating a bond of mutual care and obligation. The term is distinct from 妈妈 (biological mother) and carries a sense of chosen family.