A) referrs to the sharing of one's beverage, and the exchange of body fluids from the participants.

B) You have shared a beverage with everyone who has ever shared a beverage with someone you shared a beverage with.

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.