The term 'Tiller Opening' is a job description for a ROTO, which stands for Rototiller Operator. This position involves operating a rototiller, which is a machine used to break up soil and prepare it for planting. The operator must be able to safely and effectively use the machine to till the soil in order to create a suitable environment for planting. The job requires physical strength and stamina, as well as knowledge of how to operate the machine.