In this briefing, we document a recently formed apocalyptic militia ideology which, through the use of memes—coded inside jokes conveyed by image or text—advocates extreme violence against law enforcement and government officials. Termed the ‘boogaloo’, this ideology self-organizes across social media communities, boasts tens of thousands of users, exhibits a complex division of labor, evolves well-developed channels to innovate and distribute violent propaganda, deploys a complex communication network on extremist, mainstream and dark Web communities, and articulates a hybrid structure between lone-wolf and cell-like organization. Like a virus which awakens from dormancy, this meme has emerged with startling speed in merely the last 3–4 months.