(This is a way of saying that I agree with Faldage.)
Arga warga, and also horrorshow!
My father is a very talented reader-aloud, and on family holidays we used routinely to have a book on the go that he would read aloud from. (On camping holidays, for example, when it was raining too hard to go walking or rock climbing, and skiing holidays, to fill in the hungry hour before dinner.) One year he brought Clockwork Orange, which was one of the best books for reading aloud we ever had – even though it wasn’t till we’d finished it that he realised there was a glossary at the back. We hadn’t needed it at all, and the entire family could speak nadsat by that time. Within the family we still use occasional nadsat words such as horrorshow, krovvy, lomtick and starry veck.
By the time Riddley Walker was published my brothers and I were all grown up and married and we had long stopped having family holidays, but I suspect it would be a big hit for reading aloud as well.