When somebody has been/is being hansened, that means that they have died and people who were never close to them when they were alive lie about being close to them when they were alive. Most of the time, the reason for people hansening is to gain popularity or becoming close to the said dead person's family or 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.