The act of having at least 5 friends add a random person on facebook. Once the victim has been added, you continue to like ALL pictures, statuses, wall posts, and whatever else you can get your mouse to before you are removed by the user.

If any attacker is contacted by the victim they must proclaim GET FACEBOOK GANGBANGED BITCH!
Ayo, lets all add this bitch and facebook gangbang the shit out of her.
by D3vanG September 21, 2011
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When you post something on Facebook, and most of your friends love it, and chime in with comments.
I made up a new word, "Flexual" and most of my friends had several comments. It turned into a, "Facebook gangbang"
by Sunset Matt November 15, 2011
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