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The Most Popular Slang Word The Year You Were Born

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21. 1966: Freak-Out
These 1960s Beatles fans are having a freak-out. Yes, "freak-out" is actually a word in the Merriam-Webster Dictionary. It was added in 1966, coincidentally around the time that fans were mobbing celebrities like The Beatles. When I hear the word freak-out, I think of the Chic song "Freak Out" that was released in 1978. Do you?