"heidisissy" is a slang term often found in porn video tags. The "heidi" part refers to the female character's name, while the "sissy" part indicates the male character's gender role in the scene. In this context, a sissy is a man who is submissive, often dressed or acting feminine, and engaging in sexual activities with a woman. The term is used to describe scenes where a masculine woman dominates a submissive, feminized man. It's important to note that this tag does not necessarily mean the scene is exclusively in English; it may involve non-English speaking actors as well. This tag caters to a specific kink and audience interested in such content.