Can also mean an abnormally large turd. The kind that you make ugly faces trying to get it out...This usually happens when you've been constipated for a few days.
2. Something you do while waiting very anxiously for something.
3. An exclamation of displeasure.
2. ...so we're sittin' there shittin' bricks waiting to see if the cop is going to give us a ticket!
2. Shit a brick! We've got a test in Calculus tomorrow!
2.) Well, you can just go and "Shit a Brick"