他姓郑他心真
[tā xìng zhèng tā xīn zhēn]
Ta xing Zheng ta xin zhen can be translated as 'He is surnamed Zheng, and His Heart is True.' It suggests that someone with the surname Zheng is trustworthy or genuine. The netizen probably refers to someone dear to them with the surname Zheng, emphasizing their reliability and sincerity.