Apparently, the new
edition of the
Oxford English Dictionary claims that
muggles is a
word invented specifically by
JK Rowling for her
irritating little
books.
Actually, the
term dates back to
1920s America, when it was a
black slang word for
marijuana. It is also the name of a
track by
Louis Armstrong which featured on his 1928 collaboration with
pianist Earl Hines.