When you're listening to 50's music in your headphones at a very low volume and suddenly get the feeling that you're sitting in a movie theater before the previews and there is light music playing in the background as you talk to your friends.

The phenomenon of having to come out as bisexual to the same person/people repeatedly because they assumed or hoped that your sexuality was a "phase." Refers less to the holiday and more to the 1993 Bill Murray comedy film in which the main character experiences the same day over and over.