你姓王忘不掉我我姓李离不开你
[nĭ xìng wáng wàng bù diào wŏ wŏ xìng lĭ lí bù kāi nĭ]
The idiom literally means 'You surnamed Wang can't forget me while I surnamed Li can't live without you.' This internet handle represents the idea that you're so attached to someone, just as someone can't live or be separated from the other, no matter which surname you are using