An alternativecelebration to Christmas on December 25; this day would suit people who are lonely, people who believe that life has no meaning, people who may be stressed at the moment, etc. Depression day is the perfect time of the year to simply excuse yourself from contributing to society, and instead do what you truly want to do, even if it is laying around and doing nothing for hours.
A: Did you hear that it's Depression Day this month?
B: I'm relieved, to be honest. Sometimes being too festive is annoying.
n. - The shitty feeling felt after a long fantastic day out with friends, spouses, family, etc. Usually occurs on the ride home from said fantastic day, or before going to sleep.