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The Most Popular Slang Word The Year You Were Born

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4. 1949: Dollar Day
"Dollar day" was added to the dictionary in 1949. And there have been dollar day sales ever since. It's one of those slang terms we have grown up with. But most of us probably never even gave a thought as to when the term was coined. Of course, back then, dollar day meant things were priced at a dollar. Today, it just means a day when things are on sale.