The sexual act of lying down on your back with an erection, and having a little person sit on your dick (vaginally or anally). They then lift their legs up, you grab them by the sides, and spin them around super quickly like a Beyblade.
Example
Person 1: Man, I'm feeling so relaxed. Got a three foot tall hooker last night and gave her a Midget Spinner.
Person 2: Oh yeah, I've heard those are super therapeutic!
It's used to refer to a turbo for combustion engines. commonly used In shinyodd's streams when he plays automation the game. I honestly don't know how he didn't realize what it is.
Refers to your colleagues that jump out of their chair so fast at 5pm that their chair can still been spinning for a while after they are gone, and you are still working.
Hey Jim, Is Suzy still here, I have a question for her? No man, she is a chair spinner.