To physically carry freshly moulded, unfired bricks or masonry units away from the forming machine or cutting table and stack them in a drying area or kiln car. It is a traditional term in brickmaking and masonry manufacturing for the manual labor of handling green bricks before they are fired.
Heard on the job
I started at the brickyard having to offbear for ten hours a day, stacking wet clay until my back gave out.