The given tag "viet" likely refers to Vietnamese. However, the context seems a bit off because there's no clear indication of what aspect of Vietnamese it could relate to in this case. It could possibly refer to Vietnamese actors or content related to Vietnam in a porn video. But without further information, it's hard to determine its exact meaning.
Note that "viet" by itself isn't a common porn video tag and may not be understood by all users. Please provide more context for better understanding.