"Nut-inside-me" is a slang term used in the adult industry to describe a type of sexual content where a person experiences an orgasm or ejaculation inside their body, rather than expelling it outside. This tag indicates that the video features such scenes where characters achieve pleasure and release internally. It's commonly associated with anal sex or other types of internal stimulation that may lead to this kind of experience.
Please note that while I try my best to provide accurate meanings, these tags are often informal and might not have a universally accepted definition. They can vary based on the context in which they're used and personal interpretations.