A severely intellectually challenged person with an obnoxious greedy,
anti-social personality.
Thought to derive from an abbreviation of the Lancastrian term "Mawdesley Retard" which describes mentally deficient people from the socially isolated, lifeless, snob infested grief-hole of Mawdesley in Lancashire,
England.
Word derives from a punishingly bleak, socially isolated,
inbred snob backwater in Lancashire, UK called Mawdesley.