呦你的绿帽子哪买的
[yōu nĭ de lǜ mào zi nă măi de]
'Yo, where did you buy your green hat?' In Chinese culture, 'wearing a green hat' is slang for being cheated on by one’s spouse or partner. The user adopts it in a light-hearted or sarcastic manner to poke fun at infidelity.