fear of too many santa clauses

A person who adds their name to a gift tag in order to claim partial credit for giving the gift.

Someone who continues to subject themselves to Christmas activities -- Secret Santa, carolling, etc. -- despite feeling painfully awkward at the event.

The primary holiday celebrated in capitalist cultures. Generally observed around the winter solstice, Cashmas is a celebration of materialism in which its celebrants attempt to flatter or impress relatives, friends, and acquaintances with the extent of their purchasing power. (The "power to get".) Cashmas co-opts signs, symbols, and sympathies from other religious holidays of the winter season to mask its foundation of conspicuous consumption. In the United States, where the holiday is most actively observed, Cashmas traditionally begins on "Black Friday", that is, the day following Thanksgiving Thursday in November. Holiday observations traditionally end on January 2nd, but may arguably be said to extend through "Super Bowl Sunday" of professional American football. This event can occur as late as the month of February.

Also "$mas".

A phrase popular among first year Latin students, the phrase means "always wear underwear." The literal translation is "always where under where."

A seemingly generous present that will benefit the giver as much as the receiver.

On an old Chipmunks Christmas album, Alvin, Simon, and Theodore give Dave a gift. He's overwhelmed with their generosity until he discovers it's an empty bag, which the Chipmunks say is for him to fill with presents and give back to them.

When traffic is backed up for miles on a highway, crawling along -- and then suddenly everyone returns to normal high speeds without passing an accident, stalled car, or road construction.