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1.
When someone only attends church services during the holidays but not during the other days that church gatherings take place. Instead they "feel" the spirit only around times where everyone will see them at church which just happens to be at the Holidays or they feel they can't sufficiently celebrate the holidays without going to church and paying their dues.
~ A negative connotation ~
I swear I haven't seen the Jones at Church all year...It's Christmas eve and now they decide to show up...I swear there such "holiday christians"
by Poogie Monster December 10, 2007
 
2.
A Christian that only goes to church during the holidays.
Why does Ben even bother coming here? What, he can only make time to come to church during Christmas? He's such a Holiday Christian.
by Scolder May 02, 2010