Aboot badness
A Scottish phrase!
"Aboot" is a Scots word that means "about" or "concerning", and "badness" is a noun that refers to something that is unpleasant, unpleasantness, or wickedness.
So, "aboot badness" could be translated to "about badness" or "concerning badness".
If you're looking for a phrase that means "all about badness", you could use "aboot the worst" or "aboot the bad stuff".