You’re probably thinking, “What the heck is Zoomvroom talking about now?” Well folks, Zoomvroom is talking about a popular racing manuever. ‘Lay on the iron’ can be roughly translated as an act during a race, where a driver will cut inside another car’s lane, thus forcing the other car to swerve away to an outside lane. This has the byproduct of reducing the speed of the aforementioned car considerably. Check this out in the Steve McQueen movie, Le Mans.
Note: Never, ever try this on a public road.