Rolling is defined in options online trading as moving a position from one strike to another either vertically in the same month, horizontally to another month or some combination thereof.Other times, you may have to buy your short call back so that you will not lose your stock. Sometimes, you may even want to allow the stock to be called away if you have decided that the stock has reached a level were you want to take your profits and begin to look for another opportunity.The term roll means to.