MFA Kitty does something that totally freaking mystifies me, and then I remembered that this shit is what the innernet is MADE for, so innernet? Help us out.
What does it mean when a kitty backs up to stuff and shakes their tail (it's more like a quiver, if that makes any sense at all)?
He's not spraying anything, and he doesn't do it to people, only upright surfaces (walls, doors, cabinets, etc.). It seems to occur when he is either wanting or getting attention, usually while he's making eye contact with you and you're talking to him but not actually petting him (he likes to be pet).
Google seems to be divided evenly between "they're spraying when they do that, even though you can't see or smell anything, it's instinct" and "they are super happy!" I know some of y'all are some crazy cat-people, what do YOU think?
(Yes, I am still disgustingly sick and my planned sick day the other day didn't actually happen; I had gotten my shift covered but not my on-call, and I got called into work but it was okay because the reason they needed me was that Crazy Coworker had called in sick, then yesterday I worked both jobs. Today, however, I have totally off because HANNUKAH DAMMIT)
Edited to add: I have seen girl-cats do this, too (the one I grew up with did it a lot). Here is a YouTube video of a cat doing what I am talking about.