The term muggle has been around for decades and means many things in different environments; in the early part of the last century, among musicians, muggle was a reference to drugs (specifically marijuana) and drug users.
More recently, the term has enjoyed renewed popularity, mainly due to its use in the Harry Potter series by J. K. Rowling, where it refers to non-magical people.
Some cachers do not like to use the word muggle, but it is rapidly becoming the norm when refering to those not informed about our hobby.
Some other synonyms for muggles are:
- geomuggle (actually, this is the original word that geocachers used to describe a non-cacher)
- cache pirate