Wickedpedia: When did people in Boston start saying 'wicked'?
Briefly

In 1934, a source mentioned a 'wicked good price' in the Boston Globe, marking an early use of 'wicked' unrelated to religion or women. 'Wicked' has since become synonymous with the Boston region.
Bostonians understand 'wicked' as an adverb, not just an adjective. The origins of 'wicked' as an intensifier in Boston's vernacular remain unclear, with ties to myths around Salem witch trials and Mayor James Curley.
Read at Boston.com
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