Telling someone “those eyebrows are on fleek” would’ve been complete nonsense five years ago. (Maybe it’s still nonsense to you today. No judgment.) Trendy words pop into our vernacular every once in a while, but how about some of the most common words? To our ancestors, even basic phrases would seem as foreign as “on fleek.” But saying “The old man spit on the worm ashes”? They’d get that message no problem.