When spinning onto a rail at anything 180 degrees or over, the FS/BS nomenclature is designated by the direction of the spin and not which side of the rail you approach. I think you already know that but just starting there.
As for the lipslide, I would just call it a board slide. I guess since his tail is crossing over the rail before landing on it, it could be a lipslide technically, but it seems redundant or unnecessary to call it a lipslide every time. I (and I think most announcers) would just call it (the Louif video) a BS 270 in to board slide (or nose slide, tail slide, blunt, whatever depending on the variation).
In other words, a rider performing a BS 270 in will always land in the same orientation, so there's no need to add extra detail by trying to name what kind of slide it is. If you called it a FS lipslide people would imagine (for a regular rider) the board spinning in the opposite direction of this trick (like a regular 90 degree FS lipslide). And if you called it a BS lipslide you'd imagine the rider coming from the other side of the rail. So both of those sound confusing and unnecessary. BS 270 to boardslide for sure.
Last edited by York; 10-18-2013 at 05:46 AM.