when you have shit trickling out your asshole unvolentarully. this ussaually happens after anal sex or taking laxatives. it is different then farting and pooping yourself..that is called a SHAT. this makes a squishy noise whe it comes out.
bob: did you hear that squishy noise..?
jack: yeah. i think it was a shat.
luke: no i just skrickled in my pants shrickle