The term 3D flying refers to aerobatic manuevers where the aircraft wing spends a considerable amount of time stalled or partially stalled.
The name is borrowed from helicopter 3D aerobatics (which have been around longer) because the maneuvers have a similar style, in other words, tight turns in all directions at low airspeed.
Flying an axial rolling downline and then applying full rudder, then full down elevator, and finally adjusting aileron and throttle to achieve an inverted flat spin. The inputs are done in that order and in rapid succession
The plane drops vertically while in a nose-high attitude. Depending on head wind conditions, the model will drop at anywhere from about a 45° angle when it's calm, to vertical or even a little backwards in windy conditions. Throttle is used to determine rate of descent and the nose-high attitude of the model.
A slowly descending spin where the wings are almost or completely level. Can be upright or inverted.
Very slow forward flight in a very nose high (about 45°) attitude.
A vertical dive that instantly decelerates in its descent as it abruptly corners 90°, turning into an Elevator
A circular circuit flown whilst rolling continously. The roll can be slowed down until only one roll is performed, very slowly while flying the circuit.
A Parachute turned on end. The model starts in normal level flight and suddenly corners nose up 90°...as if it hit a wall
A continuous tail-over-nose descending flip
A few Manuever Videos: