A number of short messages sent rapidly on the same topic, usually by multiple people. Etymology: a blizzard of tweets.
"McCain had tweeted a question about how one manages a beaver, but he deleted it after the comment provoked a twizzard." Blog entry by Jake Tapper, ABC News, February 27, 2009.
a word commonly used when referring to dirty old lecherous freaks who hang around on internet forums making lame-arse comments that carry with them mundane and boring sexual connotations. this person is more often than not a total fucking spanner in reality and in cyber-space. if you come across one just abuse it until it fucks off