The Rumblr meme originated from a 2015 viral marketing hoax for a fictional app dubbed the 'Tinder for fighting.' The concept claimed to allow users to find nearby people interested in street fighting, complete with profile stats and 'casual' brawl settings. While the app was quickly revealed to be a publicity stunt by a creative agency, the UI design—mimicking the clean aesthetic of dating apps but with violent undertones—became a staple for internet humor. It is now widely used to mock online bravado, create fictional rivalries between celebrities or fictional characters, and satirize the 'app for everything' culture that dominated the mid-2010s tech scene.