Acronym that stands for "Stardew Valley", which is a video game where you can farm, tend to animals, get married & have children, and do all of the above with your friend(s) if you create a multiplayer farm.
Person 1: Hey, do you guys wanna play SDV later?
Person 2: Sure
This scary thing will find all the children under the age of 13 and ask if it can fuck them. To summon the creature, all you have to do is the Bloody Mary summoning, but all you've gotta say is "i'm under 13" three times. The creature will come out and try to rape the shit out of you. There's no way of running from it.
eh, you try summoning Mark from SDV yet?
hell nah, that's some scaryshit