high hat I. noun 1.: beaver 3 2.usuallyhigh-hat\ˈ ̷ ̷| ̷ ̷\: one who assumes an attitude of superiority : snob, swell < amid the gasps of the high-hats he … threw in his lot with the British Labor Party — New Republic > II. noun orhi-hat\ˈ ̷ ̷ ¦ ̷ ̷ \ : a pair of cymbals operated by a foot pedal