One of the three attitude changes which an aircraft can make, rolling involves rotating the plane on its axis that runs from nose to tail. You can also pitch and yaw a plane or other vehicle which can move about in three dimensions. Rolling in aircraft is accomplished by raising one aileron and lowering the other, which is done by either turning the yoke to one side or moving the stick to one side.
Also short for drum roll. There are different types of drum rolls, such as a buzz roll, long roll, and single-stroke roll.