Bricking it
In a state of great fear, very scared/in the process of 'shitting a brick'. (UK slang-derived from being so scared that you 'shit a brick')
'As the headmaster could be heard coming up the stairs to the girls dormitories me and my mates were bricking it'.
Bricking it by Cephalopod55 August 29, 2020
Get the Bricking it mug.