Yeah I think you’ve got it right that it largely has taken to mean in the community the most physically uncomfortable looking version of vulva-vulva tribbing, risk of kicking each other in the face and all. But that some people may be using it to refer to any vulva-vulva tribbing, possibly even mutual thigh tribbing, which can be comfortable, extremely erotic, and is very common. Or as you say, all tribbing. I’ve never thought of it as including such acts, but I see it for some of it. All it can take for a local community to start referring to it that way would be one slutty woman who calls it that and is really into it, then within a few years it’s all scissoring in Milwaukee