Something worthy of being written about on Twitter. It may be good or bad - it applies to anything worth a tweet.
"I'm loving the sunshine today. This weather is totally tweetable."

"Dude, I had the most tweetable burger for lunch yesterday."

"My package from Japan should arrive tomorrow. It's gonna be so tweetable."
by Lewis! August 17, 2009
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Someone worthy of tweeting about because they are very interesting, funny, or cool. Someone tweetable is always quoted.
by trololcat June 23, 2011
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The ability to consistently create important tweets without going over the top. Relaying the most important information of your day.
Joey: "Dude have you read Nick's tweets?"

Kevin: "Why?"

Joey: "They are too dank. He's got some major tweetability."
by graftonsoccer1021 March 6, 2011
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She's got some mad tweetabilities right there; her tweets constantly fill my home page with new updates.
by tweeber January 19, 2010
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