A very mythical creature, which is a dude, and a unicorn. Much like a Centaur, but with a horn, and the magical powers of a unicorn. Or if a man and a unicorn spent a magical night together, their male offspring would be a Dudeicorn. Sadly, much like a mule they cannot procreate.

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.