Gack Definition
interjection
(often repeated several times) The sound of a cat coughing up a hairball.
Wiktionary
Also used of similar noises, particularly one made to show disgust or disapproval.
Wiktionary
verb
(intransitive) To make a 'gack' noise.
Wiktionary
To expectorate a hairball.
Wiktionary
Origin of Gack
Apparently from the sound made; believed to have first appeared in comic strips.
From Wiktionary
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