It’s a technique in which you use a light jighead ( I use gama 211 typically 1/16oz) and a shad type worm (I use a gambler shakey shad). When the bait hits the water start retrieving when it reaches your desired depth, and while retrieving constantly shake the line slack to make the bait have a “rolling action”. The key is to keep your line as slack as possible while shaking. This really isn’t a bottom contact thing so you don’t need to let it sink to the bottom but you do need to be mindful of what depth you’re bait is swimming.
Good luck man!