when a man or woman thinks they are gonna release a quiet fluffy little toot and BAM! a loud wet sound followed by a big juicypile of shit in your favorite underware. FUCK! you just shit your pants!!
Gertrude: "Hey Kayla, I think there was just a terrorist attack!"
Kayla: "No, I sharted."
Gertrude: "Oh ok."
Phillip SeymourHoffman's character in Along Came Polly comes out with the line "Hey Dude, we have to go! I just sharted"
To which he adds "I farted and a little shit came out!"