我们的海誓山盟你不懂得我们的白头偕老你不知道
[wŏ men de hăi shì shān méng nĭ bù dŏng dé wŏ men de bái tóu xié lăo nĭ bù zhī dào]
This username expresses the feeling of two people who share vows as eternal and loyal to each other as the seas and mountains, wishing for a love that lasts until their hair turns white. It carries a tone of complaint or accusation towards someone else (perhaps a third party) who doesn't understand their deep affection and commitment.