"Hump Day" is a colloquial term that is often used to refer to Wednesday, the middle of the workweek.
The idea is that once you get past Wednesday, you're "over the hump" and the weekend is closer.
It's a way to express that you've reached the midpoint of the week and are on the downhill slope towards the weekend.
The term is commonly used in a light-hearted and humorous manner to boost morale and make light of the challenges of the workweek.
