be shitting a brick

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be shitting a brick

rude slang To be very scared or nervous. Of course I was shitting a brick when I woke up to the sounds of an intruder in my house!

See also: brick, shit

Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

be shitting a brick

or

be shitting bricks

INFORMAL, VERY RUDE

If someone is shitting a brick or is shitting bricks, they are extremely frightened or worried about something. He knew he would be fired if he was late, so he was shitting a brick. He stands there looking at Billy with a face like thunder. And Billy is shitting bricks.

See also: brick, shit

Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012