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1.
Special mood during Christmas.
Feeling the Christmas spirit.
I'm feeling very christmassy atm!
by Tp<3 December 22, 2006
 
2.
An enviromental condition where temperatures become low enough to remind someone of Christmas and other fantasical winter festivities.
omg is christmassy in here, cuddle with me to warm me up.
by darsh00 September 15, 2010
 
3.
Because Stefan Abingdon says so.
I'm feeling christmassy.
by ohnoitshayley December 17, 2010