Mummerset refers to a fictional rustic English county, and more commonly, the English dialect supposedly spoken there. Mummerset is used by actors to represent a stereotypical English West Country accent while not being specific to any actual county. The name is a play on words: it is a portmanteau of `mummer`, an archaic term for a folk actor, .....
Found on
http://en.wikipedia.org/wiki/Mummerset
Mummerset is British slang for the imitation of rustic West Country speech employed by actors.
Found on
http://www.probertencyclopaedia.com/browse/ZM.HTM
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