The crossword solution for the term 'EXTREME AFICIONADO' is 'NERD'. A NERD is someone who is extremely passionate and knowledgeable about a particular subject. They often have an obsessive interest in a certain topic, and they are usually seen as socially awkward or out of touch with popular culture. Nerds are often seen as having an intense enthusiasm for their chosen field, and they often spend a lot of time studying and researching it.