Vraks comes from Warhammer 40,000 lore, where Vraks Prime is an Imperial armoury world that falls to Chaos and triggers a long, grinding siege. The campaign was detailed in Forge World's Imperial Armour Siege of Vraks books in the late 2000s, centred on the Death Korps of Krieg fighting for years in toxic trenches. Online, being sent to Vraks became shorthand in the fandom for the worst possible posting. Meme edits pair that reputation with an upbeat going-away tone, making the destination itself the punchline.