The number meaning ‘19’ in Roman numerals, which represents a brand/group known as the sidemen. They are a group of seven gaming youtubers, who also venture into areas such as music, diss tracks, and acting.

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.