Dysphemism isn't an innovation, it's been around a long time. It simply means the opposite of a euphemism. Where a euphemism is a nicer way of saying something, a dysphemism is a worse or derogatory way of saying something. E.g. Referring to your car as a "banger"

"Banger" is a good thing, I think it comes from "head banging" at concerts.

No its not. It means its banged up. Broken. In the case of cars. In the case of a "banger of a tune", you are probably right.

I meant the novel use of “raw dogging”

To me it sounds like coded speech I need to put in some effort to understand. It’s a lot of effort to catch up with these, though I admit that sometimes they’re funny. But only sometimes, most times it feels forced and senseless.