To fans of loud music, an extended index and little finger is a sign of devotion to the heavy metal gods. Here, the gesture represents antlers and an insult that comes from the saying “nasadit někomu parohy,” or to plant antlers on someone. If a man has antlers, his wife or girlfriend is unfaithful. It’s also used at football games when the crowd disagrees with the referee’s decision, and by school children who use it in a mocking way to say “get lost.”