A person who obsessively Twitters--that is, writes what they are doing every moment.
Person 1: Hey dude, what's up?

Person 2 (frantically): I have to Twitter this! You just asked me what was up! *Twitters that Person 1 just asked what was up.*

Person 1: Um, sure. I, um...have to go now. Bye! *innocently grins*

Person 2: *frantically Twitters that Person 1 is leaving*

Person 1: Wow, you're such a Twitterbug!
by Kiah Zoey Rosalita February 10, 2009
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Someone who spends a great deal of their time on micro blogging service, Twitter.
“Why are you spending so much of your time on Twitter? If you’re not careful, you’ll turn into a Twitterbug.”
by Prof Bruce November 9, 2009
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