verb to fly very close to the ground at a high speed US, 1939
flat-hat
To fly an airplane dangerously close to the ground. Would you please stop flat-hatting? We're going to crash!
flat-hatting
n. flying an airplane low and recklessly. (As if flying low enough that only people wearing flat hats could escape being struck.) Some of the air force pilots were flat-hatting over the desert when one of them crashed.