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An very creepy holiday. Often occurring, but not limited to, around Christmas. If you're having a good Christmas, but then a creeper comes/cums on to you, then your Christmas becomes a Gristmas. A true Christmas nightmare. Like "The Nightmare before Christmas," except wayyy scarier and without the cool soundtrack. (The only noise you will hear is the sound a gristy guy makes jerking off in a public restroom). If someone starts Gristing (creeper texting) you on Christmas
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