to spread a term, idea, concept or style about. Origin: a sticky, flammable substance. When used in bombs, the explosion covers the surrounding area in napalm. Thus when one napalms an idea etc., they cover the area with it.
Definitions include: In the 1950's American TV show first called The Buster Brown Show and later called Andy's Gang, a character named Froggy the Gremlin would magically appear when summoned by the phrase "pluck your magic twanger, Froggy!"