Shart

When a person thinks they are going to fart, but shit comes out. Shit + fart = shart.

Person 1 "Bro I need to fart."
Person 2 "Bro we are in church."
Person 1 "Bro it's happening."
Person 2 "Bro stop!"
Person 1 "pfffthwaaap!!!”

(Entire church looks back)
Person 2 "Bro did you just shart..."