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Basically a ripoff of Santa Claus and the Easter Bunny (a ripoff himself of Santa Claus, and a lame one at that) who apparently is a giant pumpkin that appears in pumpkin patches toward midnight of Hallowe'en. He gives out candy to those who bbbbbbbbeeeeeeeeeellllllllllliiiiiiiiiiiieeeeeeeeeeeevvvvvvvvveeeeeeeeeeee. Popularized by the comic strip and TV show Peanuts by Linus, my man, who invited Lucy to go with him to the patch to see the Great Pumpkin. Twice.
Linus: Yo, luce, ya wanna go see the great pumpkin with me? (not the great popkin)

Lucy: You and me all alone in a pumpkin patch in the dead of night, where anything can happen? SURE!!
by Mr. Wallflower November 01, 2013
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Great-Pumpkin: (verb)To be "Great-Pumpkined" is to be let down in a big way, especially when others have been doubting or making fun of your sincerity over what you're hyped up; also, to be stood-up by someone.

An allusion to "It's the Great Pumpkin, Charlie Brown!" where Linus is convinced that the Great Pumpkin will come to his sincere pumpkin patch, and convinces Sally to join him. The Peanuts gang teases them and warns them they are making a big mistake. The Great Pumpkin never shows and Linus, still convinced that the Great Pumpkin will materialize, mournfully yells into the sky: "Oh Great Pumpkin, where ARE you?!"
We really hope this forecasted snowstorm doesn't Great-Pumpkin us; we could really use the snow-day!

That gift wasn't as amazing as I expected; I feel like I was Great-Pumpkined.

Let's go cheer up our boy; heard he got Great-Pumpkined by that girl on that dating site.
via giphy
by AmericanShamrock March 21, 2018
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