What does "转发500次" mean?

因为『 谣言转发超500次以上可判刑 』的司法解释，所以在回复中要“转发500次”就是说楼主说的东西是谣言不可信，嘲讽要转500次送PO主去坐牢。

ENBecause of the judicial interpretation that 'forwarding rumors more than 500 times can be sentenced', to say 'forward 500 times' in a reply means that what the original poster said is a rumor and not credible, and it is a sarcastic way to say that the original poster should be sent to jail for forwarding it 500 times.