to post your own self-promoting information on a FaceBook page under the guise of being a friend or fan.
by Joe's Black T-Shirt May 4, 2010

When someone leaves their Facebook account logged in or shares their login details with someone else at which point someone makes posts to said person's account without their knowledge.
"Bill just got facejacked. That guy gave me his login credentials for Facebook so I wrote on his wall and updated his status."
by Agent SILVERFOX February 13, 2009

The act of breaking into someone's Facebook account and editing the profile to involve potentially embarrassing or humiliating information.
by rock.star April 29, 2007

Facebook user > officially ate a pound of bacon
>user comment> i once made love in bacon grease
I hate facejacking
>user comment> i once made love in bacon grease
I hate facejacking
by jimmyjenga May 9, 2010

by rinconada November 1, 2010

When a "friend" posts something on your facebook wall that is publicly visible and is a blatant negative to you and your friends.
by The Plan Man -B 2 the Thornton September 15, 2009

To go through a friends friend list on facebook and jack friends from them. Identical to Spacejacking on Myspace, only on facebook.
by ODUB October 20, 2009
