Brown bread soaked in skimmed milk, said in 'A dictionary of archaic and provincial words' by James Orchard Halliwell-Phillipps (1868) and Wright 1857 to be the "usual breakfast of ploughboys".
Given in William Holloway's 1839 'General dictionary of provincialisms' as associated with Norfolk and Suffolk
There was a mild attempt to re-popularise it during the Second World War as an alternative to processed breakfast cereals.