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1.
A large fecal particle, commonly described as "poop", that is quickly released from the anal cavity and shot out as if it were a cannonball. This can sometimes cause a sense of shock and quick sense of pain to the rectum.

Can easily create a large blast of water to the shooter's anus. Usually recognized by it's appreciable "ploop" sound.
John Doe: "I was really turtle necking that shit and when I finally got to the bowl I just poop shotted that little bastard right out of my ass."
by Sebastianave January 08, 2012
 
2.
Something really annoying.
Tom is being so poop-shot right now.
by Donna Noble July 07, 2011
 
3.
A another person's asshole
Billy is eating someones poopshot
by Craker June 11, 2005