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4.
An alternative to the term Cyber Monday, Blue Monday is the Monday after Black Friday, when online retailers will be looking for their biggest sales from those who checked out products over the thanksgiving weekend, and will now be ordering them Monday at work.

Forget those long Black Friday lines, I'm going to order on Blue Monday!
by the_neb November 26, 2007
 
1.
Cool 1983 song from New Order. Gained giant popularity in the late 90's when the band Orgy covered it for their album Candyass.
Blue Monday is an amazing song.
by Gaaraofthedamned December 21, 2011
 
2.
1. Blue Monday is the most depressing day of the year, calculated by Dr. Cliff Arnall, a researcher at the University of Cardiff's Center for Lifelong Learning.
Factors used to calculate the date included weather conditions, debt level, time since Christmas, time since failing our New Year's resolutions, low motivation and feeling the need to take action.

In 2005 the date was calculated as January 24th, in 2006 it was January 23rd, and in 2007 it was January 22nd.

2. A song by the hard rock band Orgy from their album Candy Ass.
1. Guy: "Aw man, I feel like absolute shit today."
Friend: "Yeah, same here. I hate Blue Monday."

2. "I wish I could sing Blue Monday to my ex-girlfriend, she's such a bitch."
by L_Roku August 31, 2007
 
3.
Having blue balls on a monday before noon.
10:45a.m. Monday, I have the most uncomfortable feeling of pain in my balls. Its gonna be a Blue Monday.
by JerseyRocker17 August 15, 2011