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
by Flamehead August 20, 2006

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wednesday (from the notion that it is the hump of the workweek)
Things will go very smoothly by hump day.
by Light Joker February 16, 2006

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Occurs on the fourth floor, north wing between 12pm and 1pm every Wednesday!
Jane and Ted love Hump Day!
by hot dog lovers November 22, 2007

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a dedicated day of the week for having sex.
its wednesday night..hump day..you know what that means ;)
by jonathon pipefitter July 26, 2006

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A day for a good old fashioned dry hump. Lie on top of someone, anyone will do, and rub against them suggestively. Moan a lot. Make promises you don't mean. Lie. Do this in your office or in an elevator. What the hell. Then go and change your underwear.
I did the hump on hump day.
I humped old Humphrey on hump day.
Mike humped Louise about 30 years ago and always regretted it.
by Arlene Fester October 06, 2006

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started out in Vienna, VA as a huka-chilled day after school consisting of 3-15 of your closest friends. It later progressed (or digressed, as some may say) into a day in which you toked up before, during, and after school..then later passed out after your family appeased your munchies with dinner. One must wear greend on hump day in roder to officially celebrate. This year 4-20 just happens to fall on a hump day. Happy humpin humpers..
huka hump day can be celebrated not only with the preferred reefer. Healthy substitutes such as alcohol may suffice
by Narc April 19, 2005

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