Definitions by Flamehead

hump day 

Hump actually refers to rounded protuberance on a camel's back, or as an abnormality on a person's back.........which is located in the centre
so there is a common sense behind it that even wednesday is in the middle of the week see example

This is old tradition or belief or thinking.....which is just related with one of the week day as well as hump

hump in the centre or middle approx
And wednesday in the middile of the
both in the centre

....Hump Day

hump day by Flamehead August 20, 2006