大姨妈的红染我世界一片黑
[dà yí mā de hóng răn wŏ shì jiè yī piàn hēi]
A rather humorous take on menstrual periods—translating to "My world turns black with my Aunt Flow's crimson stain," expressing frustration about experiencing menstruation, referring to it colloquially as 'Aunt'. In China, this nickname has been used online because it sounds similar to the phrase “大月份”(big month).