The Skeleton War is a long-standing internet phenomenon that originated on Tumblr around 2013, primarily gaining traction during the month of October. It centers on the humorous premise that a massive war is brewing between skeletons and 'fuckboys,' with users jokingly pledging their loyalty to the skeletal army. The meme is characterized by its lo-fi aesthetic, use of skeletal imagery, and a heavy emphasis on 'calcium' and 'spooky' vibes. Over the years, it has become a staple of Spooktober culture, representing the internet's collective excitement for Halloween and the lighthearted, absurd side of macabre humor.