Originating in Cleveland, Ohio, "On Cuh" is a satirical way to put your word on something like phrases like "On God" and "On Moms" would. "Cuh" could mean anything so using it makes the subject not so serious and makes it more of a joke than serious matter when you're swearing on something.

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.