A gerdundermuffin is the act of climbing on top of a public toilet stall, doing the splits, and shitting into the toilet below. This is a feat, and when accomplished, the gerdundermuffiner should have a lot of pride.

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.