Actually though what does badtag mean? Does it jsut mean a bad tag?

zombie thinkz it'z when the tagz don't match or there'z not enough tagz.

English please

I think it's basically used when a tag is incorrect, useless, redundant, or just subjective.

The tag that get banned by system. Like 'rape'
That bad tag had been posted before admin added it into ban-list.
After it added in ban-list, the system replace all data of that banned tag with 'badtag'.

I don't understand why the system not removing the banned tag but replace and mark as 'badtag'

I know it because I saw my rape-roleplay jav video posts that have tag:'rape' had been replace 'rape' with 'badtag'