the phrase used to describe how one will angrily react to something that another caused to occur. When someone is so furious they will shit on anothers chest.. similar to "shit a brick" angry. The problem causer(s) will get their chest shat on... not literally.
1. My cell phone bill was 300 dollars over.. My dad is honestly going to shit on my chest.
2. You didnt put our sex tape on the internet.. I am going to shit on your chest