"Novinho" is likely a reference to the Portuguese word for "young boy" or "novice." The term "gay" indicates this content involves male homosexuality. In the context of porn video tags, "Novinho-Gay" would refer to a gay porn video featuring young or inexperienced boys as its main actors. These videos typically focus on exploring sexual experiences and boundaries between young men, often involving gentle exploration, experimentation, and sometimes innocence lost themes.