In the GPRO forums, "juniorism" typically refers to the tendency of newer or less experienced players to adopt a mindset or behavior characterized by a lack of understanding of the game's strategies and nuances. This can manifest in overly simplistic approaches to racing, such as neglecting key elements like tire management or race strategy. The term is often used humorously or critically to highlight the learning curve that new players face as they engage with the game's complexities.