People who are very enthusiastic fans or experts about a particular subject or hobby.
From the 18th-century 'buff' coats worn by New York firefighter volunteers, who were nicknamed 'buffs.' By extension, the term came to mean devoted enthusiasts or experts.
Film buffs, history buffs, and computer buffs all get their name from volunteer firefighters in colonial New York—a completely unexpected connection between 18th-century fashion and modern fandom.
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