当大姨妈看上了荷尔蒙
[dāng dà yí mā kàn shàng le hé ĕr mĕng]
'When Menstruation Falls in Love with Hormones.' While quite whimsical and unusual, this phrase combines biological elements humorously. In the Chinese internet slang community, this might imply a mix-up or misunderstanding situation with hormonal influence. '大姨妈' is colloquially referred menstrual period which also means auntie. Hence it's metaphorically funny to pair it up with hormones.