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When you just can't get your point across the way you'd like to in the space provided. Doesn't have to apply to twitter, but specifically refers to the 140 character limit of twitter, compared to the 160 character limit of a text message.
I knew what I wanted to say, but I couldn't fit it all in!
That's what she said.
No, really, I just experienced a serious case of "twitter 20".
by @fringledotus December 15, 2010
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