shit bricks

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shit a brick

rude slang To be very scared or nervous. The plural ("shit bricks") is also commonly used. Of course I shit a brick when I woke up to the sounds of an intruder in my house! My brother is so strong and scary-looking that people shit bricks when he threatens them.
See also: brick, shit
Farlex Dictionary of Idioms.

shit bricks

/a brick
To become extremely worried or frightened.
See also: brick, shit
American Heritage® Dictionary of the English Language, Fifth Edition.
See also:
  • be shitting a brick
  • be shitting bricks