(Reposting of my Goodreads Review.)
"Alles Kokolores" is a nice little collection of etymologies and word histories of words that are typical for the Rhine / Ruhr area. Debunks folk etymologies and word myths, like the myth that "Fisimatenten" is a loan from French. Written in a chatty, very intelligible style, and it also doesn't shy away from admitting when the etymology of a word simply isn't known.
Additional note: Kokolores is one of the words discussed, it means "nonsense".
vor 10 Stunden