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1. A word that can be to describe certain people on twitter. People who tweet stupid, uninteresting mundain things. Similar to the meaning of:

-being a twit
-being a d*ckhead


2. A person who is addicted to Twitter, and twittering. Diehard twitters.
She can't even stop twittering to use the restroom or eat...tweets in her sleep. She is aciting like such a tweethead.