[killwhitey]

I don't know about the Romans, but here's an example from 1627 https://wellcomeimages.org/indexplus/image/L0020217.html

[pkkim]

The upside-down "O Maners, O Tymes" is almost certainly a reference to "O tempora, o mores," used by Cicero to mourn the wickedness of his age (end of Roman republic).