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."
Real-life example, from Fark.com (discussing the show "Quantum Leap"):

Farker: "NBC canned it before it could be given a proper funeral. They Poochied the ending."
by WJB1984 August 9, 2009
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A nigga who is a pussy, and also a coochie. Carrying the properties of both, he is the double of each, multiplied exponentially. Therefore, a poochie. Can also be referred to as a pussyass nigga.
"You got two setsa genitals, a vagina and a poochie...Ooh nigga, dass a conjunction!!!" - Stinkmeaner
by Clint Powers November 16, 2010
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Poochie is a word that commonly represents the name ‘Romilly’ as it angers most people called ‘Romilly’ or similar.
Thank you Poochie
by d_u_c_kkkkkk October 4, 2021
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A loose vagina, used as a derogatory term against older women.
“Man, the mom I was with last night had a poochy.”
by hellokittyfunkopop July 1, 2021
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The collective title used by the King and Queen Poochie. There are only two and are above all doggos, puppers and pooch’s.
‘Here comes the King and Queen Poochie. All hail The Poochies! They are so magnificent and splendid. Way above us meagre doggo’s and pooch’s!’
by Queen Poochie March 17, 2019
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wow look at the man boobies on that one, he is a poochi
by dr March 7, 2003
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Another word for “Vagina”

Compound word derived from “coochie” and “pussy” so you don’t have to feel uncomfortable saying those words... plus it’s a cute word
“Her tights were pulled up so high I could see her poochie print”
by Picasso Poochie July 4, 2019
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