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The term "dullsville" first came into usage in 1960 during the Beat Generation. It was predominantly used by beatniks and intellectuals to refer to an unpleasant or boring place. In the beatnik lexicon, "dad" was also used as a term of affection. Used together, the phrase was likely a way to express boredom to a group of friends.
A Beatnik Glossary - I Can Dig It. (2016, October 29). Retrieved from http://brewminate.com/a-beatnik-glossary-i-can-dig-it/.