Derivate from the Word "bumm!", the german version of "
boom!" which (the german version of course) is widely used in the translation of comics by
Carl Barks.
The derivate "bum!" is to be found in abundance in comics by Katz&Goldt,
two cartoon superstars from Germany. Using the word in german comics provides a intellectual tongue-in-cheek connotation to all those notorious Donald Duck books.