骚年你不懂姑凉七天痛
[sāo nián nĭ bù dŏng gū liáng qī tiān tòng]
Teenager, you wouldn't understand girls' seven-day-long pain. This phrase indicates a complaint or mock about a lack of understanding from the opposite gender or young boys towards what girls endure, possibly referring to period cramps which normally last 7 days for some women.