男人都代言了卫生巾女生去代言了大姨夫
[nán rén dōu dài yán le wèi shēng jīn nǚ shēng qù dài yán le dà yí fū]
'大姨夫' is a pun in Chinese for feminine hygiene products. This phrase plays on the idea of men promoting traditionally women’s health products and women somehow associated humorously with menstrual terms, indicating gender role confusion or inversion in a comedic context. Note: '大姨夫' is colloquial and often seen as a crude or silly reference.