Top Definition
They are unknown friends on social networking sites like Facebook, MySpace, Twitter, etc. These are the people who just adds anyone they see on social networking sites. They, most of the time, sneak into photos, videos, etc. for their amusement. They also steals pictures and posts them on forums so that they, with their fellow commensals, have something to laugh at or even jacked at.
Hey, Sarah. I see that you have a lot of friends on Facebook. So, how many of those are commensals? You know, adding someone you don't know is dangerous.
by Jake Burrows June 27, 2010

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