(verb) To exploit someone's strongly held alternative values and beliefs for the purposes of tricking them into going out of their way to help or support you. The subjects of a hippie-whip are compelled to act in your interests as it is a way for them to demonstrate their commitment to their hippie values.

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.