"yummytwinks" is a combination of two words in the context of adult content. It describes a specific type or category of porn videos involving young, attractive, and slim males, often referred to as twinks. The term "Yummy" here can be interpreted as an expression of desire, lust, or appreciation for these twinks, suggesting that they are visually appealing and desirable. In short, the tag "yummytwinks" refers to a porn video involving sexy, young, and slender male actors who are considered particularly attractive by those in the adult content community.