Rural Southern Alabama. Denotes that a person, animal or object is rather ugly in appearance. Literally means that subject of sentence is "purdy ugly and purdy apt to stay that way", and thus is 'doubly' purdy.
Definitions include: 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.