back shat
person 1: what's all that brown stuff coming out of that chick's pants?  person 2: i think she just back shat herself
the result of a massive shit taken in one's pants, where the amount of poop is so much that it has nowhere to go but out the top
"person 1: what's all that brown stuff coming out of that chick's pants?  person 2: i think she just back shat herself" What is the definition of "back shat"?