The porn video tag "public-wank" refers to a situation in which an individual engages in masturbation or self-stimulation in a public space. This type of content often involves individuals pleasuring themselves discreetly, with the added excitement and thrill of potentially being caught or observed by others. The term "wank" is a British slang for masturbation, so this tag signifies public masturbation or autoeroticism in an open setting