"Metal Gear Solid V" is a porn video tag referring to a porn parody or fan-made video based on the popular video game series, Metal Gear Solid. This game series features various characters and storylines that may be recreated in an adult context within these videos. The content could include roleplaying scenarios, scenes inspired by the game's environments, or even cosplaying as characters from the Metal Gear Solid universe. Note that this tag is not related to English but refers to a specific video game franchise.