Basically its a fart. Something referred to as a shart could also be classified as a "tooter-poop". An individual who "tooter-poops" is known as a "tooter-pooper". If feces should be released during "tooter-pooping", the excrement would then become tooter-poopee.
"What the hell is that stench?!!? Juan, did you tooter-poop!?", "Watch out, I just tooter-pooped!"