Basically when you are responding to a yes or no question but don't care enough to actually answer it properly

Can also be used as a swear word after you do something such as stubbing your toe

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.