Top Definition
When someone comments on a Facebook post such as a wallpost, status update, or anything else in an attempt to bring in another conversation and divert attention away from the post and toward themselves.
Jason posted on Marie's Wall:
" have you been?"
Jack commented on Jason's wall post:
"JASON! Why didn't you text me back?"

And Jason and Jack have a conversation on the wall post that was meant to be for Marie, and thus Jack postjacked the conversation. Postjacking can also occur in status updates, but it most common on wall posts.
door Johanson Johnson 27 december 2009
Post-Jacking: Going way off topic on a Facebook post in lieu of normal human communication in an attempt to up one's cool factor.
That asshole Chuck is going way too far on my post! He is not as cool as he thinks he is! He should be arrested for Post-Jacking
door JamminJimmy 5 juli 2010
"Postjacking" is when a couple or a few people take over a comment string, usually on Facebook, and subsequently take things in a whole different direction. This is not inherently a negative thing, as it can often be amusing to witness.
Sorry for postjacking your string, Dude! We'll let things get back on topic now.
door Plasmo 6 maart 2015

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