( < Harry Potter usage, also by association with "smuggle")
1. (noun)(Geocaching) A
non-geocacher, especially
one from whom geocaching activities must be concealed.
2. (verb)The vandalization of a geocache by a muggle.
"I was unable to approach the cache during the
day because there were too many
muggles about."
"Could not find the cache, it
may have been muggled."