The use of someone else's tweet, by rearranging it for humorous (best) or other purposes. Non malicious, often replied, RT, or via back to the originator. very effective with quotebots (tweeters who post quotes).
eg1: I had a bigmac for lunch at work.
twitHijack: I made big Mac work for lunch.
eg2: obstructing the doors can cause danger and be dangerous.
twitHijack: Obstruct the doors, cause danger, be dangerous.