Interjection
The sound of a heavy smack.
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More examples (1)
THE COMPLETELY MAD DON MARTIN, a two-volume honker that includes every drawing Martin ever published in the magazine, answers the question with a definitive thwap: Martin's cartoons are still weird.
Verb
To make, or cause to make, a heavy smacking sound.
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Reflectors in the road thwapped beneath the tires, setting a regular, almost reassuring pace.