The given porn video tag "but-im" seems to be a combination of two words - "but" and "im." However, it's not clear what this term specifically refers to in the context of adult content. It could be a slang or colloquialism that might have a different meaning in another language or region.
Here are some possible meanings based on the individual words:
1. But (Conjunction): This word is often used to introduce a statement that contrasts with or serves as an exception to something previously mentioned. In porn videos, it may indicate a sudden change or twist in the scene.
2. IM (Acronym): It might also refer to "instant message" which could mean a specific style of communication between partners in the video. For example, dirty talk or sexting over chat applications.
Since there's no clear context given, it is hard to provide a definitive explanation of what this term means within adult content.