When you gambled on a fart and lost, with shit coming out instead of what you thought was gas.

When you think you have to fart but instead you shit your pants

accidental pooping when sqeezing a fart out - to shit and fart at the same time.

a shart is when you got gas followed by some mud then just a little more gas.

when you fart so hard that a little piece of shit comes out

When you think you have to fart and the make a huge fool out of yourself by then blowing out a huge pile of stinkin poo.

When you you fart so hard a short dribble of shit comes out. It happens to people a lot but they cover it up by either... Flushing their underpants down the tiolet, scrubbing with a wet tissue or running away.