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1.
When you have gassy diarrhea and spray a shotgun like pattern of shit all over the toilet walls.
I shartgunned my mom's toilet the other day when I had some bad diarrhea from eating at Pancho's.
by Ched Daily July 22, 2014
 
2.
A gun used to shoot bullets made of a liquidy like fecal matter
Hey Jared you should shoot your shartgun at that girl over there.
by Huebert February 21, 2010