In 1919, just a few months after World War I came to an end, the phrase World War 2 made its debut. The Oxford English Dictionary described it as "a reference to an imagined future war arising out of the social upheaval consequent upon the First World War." Twenty years later, the event wouldn't seem so imaginary.

Join editor-in-chief Erin McCarthy as she journeys into the past to dig up a whopping 100 words that are turning 100 this year in our all-new Mental Floss List Show. Whip out your OED and read along as you check out the full episode below.

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