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1.
The practice of tweeting in haiku with the rules of using 140 characters or less and 17 syllables.
Casey's Twaiku on Twitter was surprisingly accurate, using 140 characters and 17 syllables.
by bostoncasey February 24, 2014
 
2.
A brief, even by Twitter standards, tweet.
Kylie's tweets are so short they qualify as twaiku!
by Marcia Dumptruck December 06, 2009
 
3.
1. The practice of tweeting in haiku
2. Any such tweet
Japanese poem
Hundred forty letters, tops.
This is a twaiku
by jevanyn September 08, 2010