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2.
Feces found in adult diapers of an old person after digesting a fruitcake, which may still have the red and green candied cherries in it, resulting in a colorful festive "pudding".
Missy had to change Mr. Jone's Depends after he soiled himself, only to discover it full of "Christmas Pudding". She saved it as a gag pinata for her blind Mexican friend.
by Eman1187 December 26, 2008
 
1.
When you defecate down someone's chimney and wait for them to turn their fireplace on, to the smell of a burning boulder.

Commonly done at Christmas time.
Daniel: Holy shit, do you smell that?

Florence: Yeah, looks like someone's given you a Christmas Pudding, probably Santa.
by Toffian February 04, 2010