Used mainly in particular jobs like circuses or oil fields, might not be known in all professions. The hiring manager was looking for an experienced oilfield roustabout.
Pro Tip 2/3
Physically Demanding
Implies heavy physical work or manual labor that requires strength. The roustabout crew was worn out after setting up the circus tents.
Pro Tip 3/3
General Term
Kind of a generic term for a worker, not describing a specific role. As a roustabout, he did various tasks from rigging to maintenance.