Quick answer
He caught it and never cooked it. The verse finds the failure at the last step, after the hard part was already done.
Read both lines
The picture is oddly specific and that is what makes it land. This man is not incapable, since he managed the hunt; he simply does not finish, and the meat spoils where it lies. Failing at the end after succeeding at the beginning is a more recognizable and more uncomfortable portrait than plain idleness. Against it the second line calls diligence a man's precious possession, which is a striking valuation. Not the catch, and not the field, but the quality that carries a thing through to the point where it feeds somebody.
Related: Proverbs 12:24 · Proverbs 6:6–11 · Proverbs 10:4
New King James Version®, Copyright © 1982, Thomas Nelson. All rights reserved. Full copyright information. Scripture provided by API.Bible.
Go Deeper
If this verse has been used to put weight on you that it was never carrying, ask about it directly.