only to be used when someone is being a total ass and you want to sound like a dumb loser who can not come up with a better insult
you are being a shit headed butt face because you did not invite me to your birthday party
When one regrets opening their mouth about something.
Then I shall shit my face.
somebody with a shit eating smile.,like a politician or a car salesman.
I really hate those shivell shit face types, they're so cheezy looking.