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.