when you eat so much food for Christmas dinner/lunch, that you need to lie down and pass out for the rest of the day.
I had so much food last Christmas that I got Christmas Coma at 2pm and didn't wake up until 4pm the next day.
by PoisonPurple May 11, 2016
noun: When one is overjoyed at break from work/school and presents from christmas holidays, therefore does no work whatsoever and just lounges around with presents. Can be abbreviated to 'chroma'; a person in this state is defined as 'chromatose'.
Person 1: Where's Sam? I haven't seen him all day.
Person 2: Didn't you hear? He's in a christmas coma.
Person 2: Didn't you hear? He's in a christmas coma.
by MrrrH December 16, 2009