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1.
The day before Christmas Eve. Since Adam was created before Eve, and the need to be equitable in the holiday season, Christmas Adam creates further anticipation of Christmas Day.
When is your family coming to our place?
On Christmas Adam and leaving New Year's Day.

Christmas Adam is the last chance to prepare for the Christmas Eve party.
by JSR December 23, 2005
 
2.
The day before Christmas Eve (since Adam came before Eve)
Today is December 23 - it's Christmas Adam.
by BassInYourFace December 23, 2009
 
3.
The day before Christmas Eve. The bible said Adam came before Eve, so it is only natural that Christmas Adam comes before Christmas Eve
Dude, I cant believe its Christmas Adam, christmas is in 2 days!
by lilolita December 24, 2009
 
4.
The day before Christmas Eve.
"Hey Joe, when are your folks coming into town?"
"I'm pretty sure my mom said they were heading in on Christmas Adam."
by MBGanja Babe December 28, 2009
 
5.
Christmas Adam (which can also be known as Christmas Eve Eve) is December 23rd, the day before Christmas Eve. Because in the Bible, Adam was created before Eve, Christmas Adam is the day before Christmas Eve.
DeErricka's birthday is on December 23rd, also known as Christmas Eve Eve or Christmas Adam.
by Miss'Deeds December 24, 2009
 
6.
A REALLY lame pun referring to the twenty third of December: the day before Christmas Eve.

Derived from the Biblical Adam and Eve in the Bible's book of Genesis.
My grandmother told me a story of a young girl who asked where Adam was in Christmas. The girl's parents were like what the heck?

She explained "Well, there's a Christmas Eve, so this is obviously Christmas Adam!"

* rimshot *
by TurtleShroom December 29, 2011
 
7.
The day before Christmas Eve
I'm going to see my folks on Christmas Adam.
by Uncle Kevo June 24, 2011