As a verb, it means to dump a bunch of exposition at the end of a movie or TV show that has radical consequences for the story (
e.g., the exposition states that the main character
later died tragically), especially if it would have been better to show this development instead of describe it.
The term comes from episode 4F12 of the
American animated series "The
Simpsons" ("The Itchy & Scratchy & Poochie Show"). When the new addition to the animated show-within-the-show "Itchy & Scratchy", Poochie (voiced by Homer), proves extremely unpopular, the producers decide to
kill him off. Homer tries to persuade them otherwise by
reading a touching speech as Poochie that he thinks will end up in the show and endear the viewers to him. Instead, in the final
cut, somebody else provides Poochie's voice, and states that the character has to return to his home planet. Crude animation then depicts Poochie "beaming up", and a note is tacked on that reads, "Poochie died on the way back to his home planet."
