Flat-Hatting
From a 1944 Army Air Corp Training Manual called Flat-Hatting Sense - very funny.
"Flat-Hatting is a form of flying that discourages longevity. Originally the term simply meant flying low needlessly. That definition has been expanded to include grandstanding, or showing off ?- flying foolishly and carelessly. The term itself is said to have arisen from an incident in which the wheel of a low-flying plane struck a pedestrian on the head and crushed a new top hat he was wearing. Besides being grounded for quite a stretch, the pilot had to buy the pedestiran a new hat, costing $12.50, including tax. Hence, the name "Flat-Hatting" ?- which is probably as good a name as any."
Oil-burning - An "Oil Burner" route is the name given to an authorized area that military jets can low level in, for practice.