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.
The guy was driving like a total Mawtard.

The global financial crash was caused by a bunch of Mawtards
by jjpwfelli June 11, 2016
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Any obnoxious, anti-social, mentally disturbed, physically deformed, inbred retard. Usually from socially isolated, lifeless, joyless shitholes like Mawdesley - a tiny cunts paradise in the arse end of nowhere
I just got cut up by a fat old scowling cunt in a Range Rover. Fucking Mawtard.
by mawded September 4, 2016
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