Guiltmas is used to describe the guilty emotion one feels, specifically around the Christmas/holiday time, when they have failed to do enough giving, sharing joy, caroling, being nice to family & friends, and usually ruined one or more family gatherings. If you have not lived up to the holiday spirit, you definitely understand Guiltmas.
K to sister B: "Mom is still mad because Eli threw up last Christmas and ruined the entire holiday season."
B: "Well she's mad at me, too because I am already ruining Christmas 2016 just because I am getting divorced!"
Karen: "I hate the holidays. Tis the Season, Merry Fucking Guiltmas to all!"
B: "Well she's mad at me, too because I am already ruining Christmas 2016 just because I am getting divorced!"
Karen: "I hate the holidays. Tis the Season, Merry Fucking Guiltmas to all!"
by Funny Moms December 14, 2016