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!