The porn video tag "trans-metendo" seems to be a combination of two words in Portuguese: "trans" (referring to transgender or transsexual) and "metendo" which means inserting. So, the tag likely refers to a scene involving a transgender or transsexual individual engaging in penetrative sex, specifically with a penis being inserted into another person or orifice. It is a video tag for adult viewers who are interested in transgender content and penetrative scenes.