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1.
A twitter message (tweet) that is typed out and sent via your tushie by mistake. Most commonly sent using a mobile device.
Lady Gaga made the phrase popular by responding to her own tushie tweet.

The tushie tweet:
@rafamterra $mkkkppo #andalogobusão®

The response:
Lady Gaga: I think I just tushie-tweeted by mistake! :) sorry! 16 hour 20 min till The Edge of Glory! X
by hausofgengar May 16, 2011