Proud or conceited in a way that shows you think you're better than others.
From British slang, likely derived from 'chuff' meaning to puff or swell with pride, combined with the suffix '-y' to create an adjective. The term became popular in British English in the 19th century.
Thomas the Tank Engine fans know this word from 'Chuffy the engine!' It's a perfect example of how British dialect words got immortalized in children's literature—the term actually means self-satisfied or pleased with oneself.
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