The act of laying on one's back with an erection, then having a midget take said erection in anally to then also lay on their back and be spun by the man laying down
A: Yo, how did the date with that chick go?
B: Pretty well, by the end of it we did a good ol' midget spinner
A: Damn bro
A small, preferably Mexicanhuman being that simply is able to move by oneself (or is able to move when kicked by other, more superior beings) that spins around in a circle.
*when viewing a small adult spinning around in a circle*
"Oh, Brad, look over here. I found a midget spinner."