Hope there is a good prize?
it is from the Southwest USA where people drank so much on the weekend they were hung over and sad on the Monday.
There does not seem one exact explanation for the origin.
good answer! I now explain why.
For the average American worker, Monday and Friday are work days with a special meaning. The former is often referred to as Blue Monday because another work week has begun after two days of time off for oneself. The Monday morning blues often mean that the worker must face another five days of getting up early, putting up with rush hour crowds, taking orders from demanding employers, meeting important deadlines on schedule and fulfilling job responsibilities. It is no wonder that the trek to work may not be a cause for great joy. The average worker may feel a bit depressed over the prospects of beginning another week and stressed out before it has begun.
If one enjoys his work, then Blue Monday may not be so traumatic. Yet, if one is not happy on his job, Blue Monday can be a cause for great pain and anxiety with the hope that Friday may not be very far away. Hopefully the week's routine may offer few surprises and if all goes well, there may be no major problems or conflicts to upset the work equilibrium.
It is for this reason that a Friday morning is greeted with warm anticipation and an upbeat attitude. T.G.I.F. stands for the words "Thank God It's Friday." At the office or workplace colleagues will greet each other with these four letters and everyone knows what they mean. This expression will elicit a great smile of satisfaction from most office workers. They soon think of how they might spend the weekend, since most offices and schools are not opened on Saturdays and Sundays.
Closing time on Friday, therefore, brings in the pleasure of a two-day weekend. For Americans, this is a time to go off somewhere with friends or by oneself to recharge one's batteries and renew one's energy.
When Friday does come around, the excitement which it engenders becomes contagious as co-workers and colleagues get together and brace themselves for their weekend plans. Perhaps they will take off into the country for an overnight stay at a mountain resort, or go skiing at a nearby lodge or better yet, stay at home and do absolutely nothing at all.
When Sunday night approaches, they are sufficiently refreshed or totally exhausted. Most, however, are sufficiently invigorated to get up on Monday morning and trudge off to work renewing the week's cycle. If the mood on Monday is a bit more subdued, it is because everyone knows another Blue Monday has begun.
In recent years some places of employment have begun to initiate a four-day work week and the computer age has even made it possible for many jobs to function from the home without the need to commute. Even some holidays which used to fall in the middle of the week are now moved to Monday guaranteeing a longer weekend. Perhaps the traditional attitudes towards Mondays and Fridays may soon be a thing of the past.