Excited, energized, or enthusiastic about something.
From 'jazz' (the music genre, origin disputed but likely from African-American slang). Added '-ed' as an adjective to describe a state of excitement, popularized mid-20th century.
That a word for an African-American art form became slang for general excitement shows how jazz revolutionized not just music but everyday language and attitude—it literally changed how people describe feeling alive.
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