when two or more people are masturbating. this can be back- to-back, in the same room, same car, etc.
Cassidy and Mac participated in social masturbation last night
The act of using Myspace, Facebook, or Twitter hours a day, in the name of being more social, at the expense of actually being social.
You don't have any friends.
Yes, I do, I have 300 friends on Facebook. I'm social.
No, that's social masturbation. Maybe you should go to a party or something.