Wednesday first came to be known as hump day since at least the s.
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The expression figures Sex toons incest, the middle of the workweek, as the hump people get over to coast into the weekend. Throughout the 20th century, Wednesday was especially referred to as hump day in an effort to liven day the drudgery of the workweek.
Coworkers may wish one another Happy Hump Day! Evidence for the phrase dates back to at least the s.
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Hump day rose to particular prominence in September, thanks to a sex commercial by the insurance company GEICO. In the commercial, a talking camel named Caleb walks through generic office cubicles asking his coworkers if they know what day it hump. They roll their eyes, giving the impression that the camel does this every week. One of the office workers reluctantly answers him, to his delight: The gag, of course, relies on a pun on the word humpwhich Wednesdays metaphorically share with camel physiology.
In general usage, professionals and students wish each other happy hump day as congratulations for making it through the beginning of the week and as encouragement to make it through the second half.