to be extremely scared or freightened

when you are extremely scared or afraid of something

The sort of fear your asshole knows about. A strange mix of constipation and anal laxity.

constipation when on heroin and other opiates.

shitting bricks is when you are literally shitting bricks. it hurts so bad and its so hard to get out

something that occurs when you are very startled, which involved bricks being shatted

Stress induced constipation. Shitting bricks occurs in situations where you are so overwhelmed in your thoughts that you can't relax your asshole to take a shit. When you finally push it out, it feels as though you've passed a turd with dimensions similar to those of a brick.