给大姨妈说再见
[jĭ dà yí mā shuō zài jiàn]
'Say Goodbye to Aunt Flow' is an informal expression referring to menstruation. By saying goodbye to 'Aunt Flow,' this nickname implies either farewell to a past period of physical growth, the end of puberty-related troubles, or possibly the joy after getting menstrual disorders solved, reflecting the speaker's desire to be free from the discomfort associated with it.