Terraria is a 2D sandbox adventure game released in 2011 by Re-Logic, where zombies are among the first hostile enemies players meet after dark on the surface. Their distinctive groan became familiar through countless hours of nighttime survival, Let's Play videos and livestreams. As Terraria clips spread across YouTube and TikTok, the sound was lifted out as a standalone meme effect for undead, tired or lurking characters. It remains popular because it is short, instantly recognisable to players, and clearly reads as a zombie even without the game footage.