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1.
acronym for Mel Gibson Mysteriously Disappearing Accent Syndrome.

It describes anyone who, over the years, has either accidentally or purposely altered their accent. This can occur by someone moving to a new country or even part of the country, or by someone setting out to change their accent.
It's a shame that Tim fell victim to MGMDAS, his Scottish accent was so sexy.
by Khanada Rhodes July 05, 2005