No, it's not a word.
If one were to invent it would probably mean a really powerful slam dunk in basketball.
Apparently, upon googling, Nike did indeed release a pair of basketball sneakers called "hyperdunks": https://store.nike.com/us/en_us/pw/hyperdunk-shoes/bsyZoi3
But please don't use the word hyperdunk in any real conversation. It's not a word, just meant for marketing.
July 6, 2019
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