Chrismukkah is a pop-culture portmanteau neologism referring to the merging of the holidays of Christianity's Christmas and Judaism's Hanukkah. The term was popularized beginning in December 2003 by the TV drama The O.C., wherein character Seth Cohen creates the holiday to signify his upbringing in an interfaith household with a Jewish father and Protestant mother (although the holiday can also be adopted by all-Jewish households who celebrate Christmas as a secular holiday). Chrismukkah is also celebrated as an ironic, alternative holiday, much like the Seinfeld-derived "Festivus". USA Today has described it as "[t]he newest faux holiday that companies are using to make a buck this season". In 2016, the sunset of December 24 to the sunset of December 25 will coincide with 25 Kislev, the first day of Hanukkah. Hence, Christmas and the beginning of Hanukkah will be celebrated on the same day, making this rare occasion a Chrismukkah. Such an occasion will not happen again until 2073.
Long before "Chrismukkah" entered the popular lexicon in the early 21st century, Christmas and Hanukkah celebrations had been informally merged with one another. A Christmas celebration with a tree, songs, and gifts became a symbol of being a part of German culture for many middle-class Jewish families in the 19th century. Some Jews celebrated Christmas as a secular "festival of the world around us" without religious meaning, or they transferred Christmas customs to the Hanukkah festival. In the 1990s, the popular sitcom Friends often portrayed Jewish characters Ross and Monica celebrating Christmas with their Christian friends, signifying many contemporary American Jewish households who celebrate Christmas in the strictly secular sense.
Chrismukkah was named for the first time, and prominently featured, in the FOX television program The O.C. (2003–2007). Show creator Josh Schwartz used the holiday (which the writers almost named "Hanimas") to depict, he later said,