Thank God Its Friday has been the unianimous exclamation of the modern day working folks.
The Wiki tells very little of this acronym like it started in the America, it has become a relief of expressing that I have finally finished my work. There is also an anticipation of relaxation from partying etc at the end of the week.
TGIF restaurant link has actually capitalized on this and even announced discounts on friday happy hours!!.
Am happy its a Friday and not a manic monday.