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"Twitter Jacking" is when you copy someones tweet instead of re-tweeting, therefore, not giving them the credit.

If it happens to you, then you have been "Twitter Jacked".
I hate 123starblizzy, I'm going "Twitter Jacking" and copying his tweet, people will definitely think it came from me. Also known as Twacking.
by Athalonius November 04, 2011