大姨妈红遍全球
[dà yí mā hóng biàn quán qiú]
Periods (common vernacular 'Aunt Flo') spreading around the globe red. It's a humorous exaggeration referring to menstrual cramps or cycles, implying it's such a universally experienced situation amongst women everywhere. Sometimes it's said when wishing bad luck upon others humorously in casual chat lingo.