It seems like the word you are referring to is "nü" or "Nu" which can have different meanings depending on the context. Here, I will provide you with potential meanings:
1. Nü or Nu could refer to the Chinese term 女人, meaning 'woman' or 'female.' In this case, it may be used as a tag to denote a video involving female performers.
2. Nu (Nyu) can also be a Japanese slang term that means 'cute' or 'adorable.' If the context is related to anime or hentai porn videos, it might refer to a cute and adorable character or scene in the video.
Please provide more information if you need further clarification.