sound produced by victim of punch in the stomach. from: 
the original word, meaning "to catch the breath convulsively and audibly (as with shock)" is not directly imitative
Used to express amazement, shock, and excitement, due to it being a common outcome when one types random letters on a keyboard. KnowYourMeme
interjection expressing shock and alarm, often for humorous effect: "Yikes! It is cold!"
sound of a defibrillator (ref)
medical human electronic hit electric shock therapy heart attack
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