The sound comes from Minecraft, the sandbox game released by Mojang in 2011, where zombies are common hostile mobs that attack players and villagers at night. When a zombie infects a villager on higher difficulties, the villager becomes a zombie villager, a mechanic players know from survival mode and village raids. The groan has been clipped from gameplay and shared on soundboards and in fan edits because it is short, recognisable to millions of players, and works outside the game as a generic undead infection cue.