On twitter.com, What is a "twatter"?

A person who tweets overindulgently, filling his follower's pages with his tweets, essentially blotting out any one else who is tweeting. It is essentially dominating their followers' walls - kind of like a person who just won't shut up so others can speak

found this on urbandictionary.com

A person fond of frequently publishing over-indulgent twitterings which saturate their followers' pages to the point where they remove all contact and leap from the nearest fifteenth floor.

Example 1: Mother ******* Teresa will that Stephen Fry ever shut the **** up the ******* twatter?

Example 2: Have you read that over-indulgent twitter from Sam Crawford? He's obviously a twatter.

The hypocrisy of his status update was evident when he wrote a second example which fruitlessly attempted to define the word Twatter.

What Is Twatter