What is "chrismukkah"

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 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".