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Hijacking a shared resource tag, such as a Twitter hashtag or Delicious category for personal gain or to dominate the conversation.
Our shared conference tag was great until all the advertisers starting tagjacking the conversation with sales pitches.

Brian Brushwood was totally tagjacking the live Twitter hashtag feed at the Digg party, and it really got out of hand.
by arlingtone April 15, 2010
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On Facebook, when somone mentions you in a comment or tags you in a post completely irrevelant to you.
"OMG , like - he totally keeps tag-jacking me on posts his mom writes...she doesn't even know me... I mean really."
by James Kressley April 20, 2015
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