muggle
n.— Note: Borrowed from J.K. Rowling’s books about Harry Potter. «He glanced around to make sure no muggles were watching. UF’s campus is crawling with muggles, the term for those oblivious to the worldwide scavenger hunt known as geocaching.» —“High-tech hunt” by Jessie Coleman in University of Florida-Gainesville Alligator Oct. 17, 2006. (source: Double-Tongued Dictionary)
Further reading
It’s hard to remember how to spell the names of some cities. Tallahassee, Florida, for example. Then there are towns with very few letters to remember. Y, a tiny town in northern France, has only two main streets, which come together to form...
Robin, in Jacksonville, Florida, has long wondered why the traditional collar word by equestrians is called a ratcatcher. There’s a long history in the horse world of referring to various forms of attire as a ratcatcher, including blouses and...
Is being used by other affinity groups to refer to non-initiates. e.g., in fandom for non-fannish people. Very similar in usage to the longstanding use of “mundane” as a noun.