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1.
The mass of Jesus Christ. Approximately 63kg.
John 17:12 "The Christmass was that of an average man, not fat, for he was pious & consumed donuts sparingly."
by John Superman December 07, 2013
 
2.
When your wife or girlfriend gives you anal sex on Christmas morning!
I got the best Present of all, Christmass!
by assman08 December 24, 2008
 
3.
Some with whom you'd only have sexual relations with on or around Christmas.
"Dude, I totally got some Christmass at the company party last night!"
by Juliaaa December 24, 2007