1) To be tricked into visiting a shock site (namely meatspin.com) by bros claiming the site is actually something interesting or awesome often via a seemingly harmless (often masked or renamed) text or pic link.
Examples:
a) Some troll's signature in so-and-so forum lured me in with tasty bacon pics, but it was a trap. I got spinned, bro.
b) I stepped away from my computer for just a minute, but that was enough time for my roommate to set up a trap. Dude, I got spinned.
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 MidgetSpinner.
Person 2: Oh yeah, I've heard those are super therapeutic!
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.
HeyJim, Is Suzy still here, I have a question for her? No man, she is a chair spinner.