Ireth
Myth Weaver
It took me a while to understand Brian Johnson too, it is a little garbled sometimes because of how he sings. I have always been good at my listening ability, so don't feel bad. Axl Rose poses a similar challenge.
By the way, there is a parody of that song... "Dirty Deeds Done With Sheep."
Let me guess, the parody's by Weird Al Yankovich?