"Loan4K" is a porn video tag that can be understood as follows:
"Loan" - This indicates the theme or scenario in the video, which involves borrowing or lending money, possibly with sexual implications.
"4K" - This refers to the resolution of the video, which is 4K or Ultra High Definition (UHD). It signifies that the video has a high-quality visual experience, offering sharp and detailed images.
So, this tag represents a porn video with a scenario involving money lending/borrowing and is filmed in 4K resolution for a better viewing experience.