"bioshock-elisabeth" is a specific porn video tag, referring to a particular type of adult content that involves role-play or cosplay related to the popular video game series Bioshock. In this case, "Elizabeth" specifically refers to one of the main characters from Bioshock Infinite, a young woman named Elizabeth who is often depicted in a vulnerable or sexualized manner by fans. This tag would be used by adult content creators and viewers who are interested in pornographic material featuring elements inspired by this particular video game character.