To go through a friends friend list on facebook and jack friends from them. Identical to Spacejacking on Myspace, only on facebook.
Man, Emily's got some hot friends. I'm gonna have to facejack a few of them.
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Someone or group of people that comment on your Facebook post and then carry on to have their own unrelated conversation.
I posted on Facebook about my swollen ankle. Bob and Margret both replied then carried on talking off topic to themselves on my post! You fecking Facejacker!