"Entre" is a Spanish word which, when used as a porn video tag, generally means "enter." In the context of adult content, it can imply penetration or the act of one body part moving into another. This term is commonly used in tagging Spanish-language porn videos or by non-native speakers who use Spanish words to describe sexual acts. It's essential to know the language and cultural nuances when using these terms, as they may have different meanings or connotations in various contexts.