The point at which a performance has become so bad that one is forced to get up from their seats and leave the auditorium or stadium.
"I was born an Ohio State fan. I live as an Ohio State fan. I willdie an Ohio State fan. But the shat hit the roof in the game against Florida when they basketball'ed the touchback."
A crater-shat is a woman or young teenage girl that has a face that is both hideously ugly and revolting and covered in slews of pimples but at the same time, has the confidence to persue a man that obviously would never be caught dead near the disgusting woman.