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The act of using all 140 characters in a tweet on twitter. Twitter's equivalent of a Tetris hence it being a twitetris. Hashtag added as it is Twitter after all.
Example 1

*After a long tweet using all 140 characters*

A friend replies, "You just got a #twitetris !"

Example 2

*long tweet featuring 129 characters ending with #twitetris*
by minisav June 14, 2011