When you stroke your cat down her back does she suddenly go into elevator butt position lowering her front end and raising up her hind quarters? If so, that’s a very common position meant as a friendly gesture and an invitation to continue scratching or petting her in that location.
You’ve Hit the Spot
Although elevator butt may seem rather insulting to us, it’s actually the cat’s very positive response to the fact that you’ve hit just the right spot when petting her. Typically, that spot is at the base of her tail. Not all cats enjoy being scratched or petted along the spine or at the tail base, but if yours does, you’ve probably witnessed that elevator going up.