Byprouduct Bae-prod-ukt noun 1. Something created incidentally that is more appreciated than the initial goal. As opposed to a Buyproduct: something purchased because you were at the store already but not something you went to the store to purchase. "He famously saved all the lengths of thread that were too short to use and at the end of his career sold this byprouduct for more than even the most expensive of his embroideries." -Sharilike, Sharon."Collected Oddities of Odd Collectors".