When you are smashing out a task or performing to a high standard. Originates from kitchens where chefs are working to a high standard, quickly and efficiently turning out covers.
A very stimulating activity of discontinuously throttling a (preferably) powerful motorcycle to produce an imaginable sensation of impending momentum as the drive chain repeatedly goes into and comes out of slack while the motorcycle hurls itself down a (preferably) steep road.
No wonder the block disintegrated, he was in second to get past that truck, and then somehow dropped it in reverse, and he was GUNNING the shit out of it at the time.