@JLeslie “I had assumed it was just a word to acknowledge the holidays are celebrated around the same time, but your link, and you, are saying it’s like it’s own holiday?”
I think it can be either depending on who is celebrating. The television coinage came about because the character wanted a way to represent his particular relationship with his beliefs and heritage. But it seems the term could also be used for groups of people who aren’t individually of mixed heritage, but are not of all the same heritage (that is, groups where some are Jews and some are Christians, even if no individual person is of mixed heritage or beliefs). The origin of the word, after all, does not fully determine its meaning.
My main point on this thread has simply been that we don’t get to determine what other people believe or how they celebrate it. If a person of mixed heritage feels like they want to celebrate both holidays, they can. And if they feel that the best representation of their beliefs is a mixed holiday, that’s also up to them. They don’t need to give it a name in either case, but I think that “Chrismukkah” could be sensibly applied in both instances if the celebrant so chooses. If it helps bring people together, great.