When you're a tween stuck with your family in Disneyland in Cars Land and you seriously need to nut, so you stick your meaty-ass, prepubescent dick inside Mater's rusty old exhaust pipe, and he makes nut so fast that your mum almost doesn't catch you with your dick out in Disneyland.

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.