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1.
(Noun): Originally, an obscure “reverse holiday” involuntarily observed by several hundred people just in the Capitol Hill area of Washington, D.C. Named after a false prophet out of Tennessee. People “celebrate” Fristmas by canceling vacation plans at the last minute, staying away from their families and friends, and working on the Sabbath. The emblem of Fristmas is not a Menorah or Christmas Tree, but a Gavel. (Verb): To work involuntarily on a weekend, a holiday, or a vacation, as in, "I just got Fristmased by my boss, and I have to go into the office."



You are all set to go on your planned holiday vacation when your boss calls to say "Merry Fristmas" then proceeds to tell you that he canceled your already approved vacation, and that you need to come into work.

by Uelandia December 19, 2005
 
2.
The full pre celebration of Christmas before the 25th of December (usually among just friends)

Fristmas or 'Fake-Christmas' includes the regular Christmas day festivities (presents, full xmas dinner, lots of drinking, Xmas movies and frolics) the only difference being it is strictly friends invited.

Fristmas usually happens a week or so before everyone has to return to traditional family Xmas obligations.

Fristmas originated when a student in halls decided to do a full Christmas dinner for her 10 housemates and friends in 2007 (in Student 'oven' microwaves) and has happened every year since.
'Hey, are you guys coming down for Fristmas?'
'HELL YES!'
'Sweet, bring some crackers. I bought a Turkey'
by teacupsandtoast December 08, 2013
 
3.
a celebration of awkward extended friendship groups and passive aggression.
Monica was looking forward to this years fristmas celebration. It had been so long since she had spend some quality time in the company of close friends, bitching about the misforntunes of newly friended Bertha in a drug, cake, and cheap gift fueled environment.
by harry high knee October 29, 2011