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1.
When someone is shit scared or in a scary situation, they are going to crap in they're pants.
He was bricking it, before I even took a swing at him.

I was bricking it the first time I went on a plane.
by AL January 22, 2004
 
2.
To be frightened, 'to be shitting yourself'
They were bricking it about the DB meeting
by 1986J November 17, 2011