Noun: 1. Person who uses Twitter to broadcast asinine pronouncements, petty complaints, churlish insults, insane misjudgments, misogynistic rantings, reckless accusations, absurd vulgarities, vindictiveness unlimited, and/or unhinged ravings, seemingly unaware or unconcerned with their veracity, propriety or wisdom.
2. Person who apparently does not realize how Twitter works, and that others much smarter than one's self will be seeing and reading posted tweets and passing judgment on the character of the writer. (Note: Definition 2 does not preclude Definition 1.)
1. That Donald — such a twitteridiot to be tweeting in the middle of the night about trivial slights.
2. Grandpa's a total twitteridiot; he confuses tweeting with privatetexting.
Any news item or public event, no matter how small or hard to find, that arouses a sudden and significant level of excitement from the Twitter community.
Bob: Man, did you see how Twitter lit up after Ahmadinejad's statement that "(There is) no significant need for the United States"?
Dave: Yeah I know. He really found the twitoris with that one.