While engaged in anal sex (without a condom) you start tickling her profusely. If she laughs or giggles you rip it out of her ass, smack her across her face with your dick and ask her what the fuck is so funny.

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.