The porn video tag "sexy-cock" refers to an attractive, well-endowed male genitalia that is considered visually appealing and sexually arousing. In this context, "sexy" implies that the penis is not only large or well-shaped but also aesthetically pleasing, while "cock" is a slang term for the male genital organ. This tag is commonly used to describe content featuring such a penis in a visually stimulating way, typically found in adult videos and images.