Originally a nickname for
Hamilton, Ontario, Canada; A city or town that has a higher than normal rate of mullets per capita. This is presumably caused by the complete lack of self worth by the individuals who live in these places. High rate of white trash. Usually must imply a real dump of a place as well.
Examples of Mulletvilles in fiction: Trailer Park Boys,
Sunnyvale Park
Examples of actual Mulletvilles:
Hamilton Ontario Canada