The dialect or manner of speech characteristic of Boston, Massachusetts; the Boston accent and speech patterns.
From 'Boston' (the city) + '-ese' (English suffix meaning 'language or style characteristic of', as in 'journalese' or 'computerese').
Bostonese is famous for dropping Rs ('cah' for 'car') and adding them where they don't belong ('idear' for 'idea')—it's one of America's most recognizable and parodied regional accents.
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