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To fly an airplane dangerously close to the ground. Would you please stop flat-hatting? We're going to crash!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.