Definition of christmas ham:
(n) :
A ham, boiled and then baked in the oven with mustard, served sliced at Christmas as one of the traditionally most important parts of the Scandinavian julbord (special Christmas-time smörgåsbord).
(n) :
Ham prepared in various other ways in various regions at Christmas, such as stuffed ham in parts of the United States, or ham soaked in fruit juices in the Philippines.