"From the hip" is a gunslinger term from Westerns wherein a gunfighter would draw his six-shooter by tilting his firearm back out of its holster and firing as it clears the lip. The motion is fluid and swift, but does have the disadvantage of not being as accurate as an aimed shot. For a fast-draw gunfight, this was considered the better way to proceed because of the speed at the expense of accuracy.
One could practice aiming while shooting from the hip, but there's a lot involved. As the hand contacts the handle, it has to wrap around the grip and the fingers need to find the correct position on the trigger without shooting a big toe off. Then the web of the thumb or the thumb itself would cock the hammer back, assuming the revolver was a single action variety. While that was occurring, the arm and wrist would be pulling the gun upwards and back to clear the holster and to make the barrel parallel to the ground. Whatever aiming the shooter wished to do would take place, and then the trigger would be pulled.
It's a lot harder to do properly without shooting a hole in your boot.
Iron Noder 2017