Dear女生必须乖Dear男生必须拽
[dear nǚ shēng bì xū guāi dear nán shēng bì xū zhuài]
It translates as 'Dear girls must be obedient, dear boys must be cocky.' It might be used sarcastically or seriously by someone who doesn't agree with these societal expectations or just as a lighthearted observation of common social behavior patterns.