butt tweeting 

What happens when you sit on a smartphone with the Twitter app installed. Similar in concept to butt dialing, but more embarassing because it can be seen by the whole world.

Herp: dsfargeg asdf blueberry muffins
Derp: @Herp wtf?
Herp: @Derp Sorry, my smartphone keeps butt tweeting.

butt tweeting by Kimura January 4, 2012