Loop the loop
Definition 1 of 2
Pro Tip 1/3Aviation Stunt
Used to describe daring aerial maneuvers, often in air shows or pilot training. 
Pilots must train extensively before they can safely loop the loop.
Pro Tip 2/3Metaphorical Use
May be used metaphorically to describe something very confusing or complicated. 
Trying to understand quantum mechanics at first can feel like trying to loop the loop.
Pro Tip 3/3Action Intensifier
Expression may be used to convey doing something with extra flair or drama. 
She looped the loop on her skateboard, wowing the crowd.