A friend and bandmate of mine had a landlord named Desnick. One day we were rehearsing for a gig and she picked up a little piece of fuzz that had landed on her guitar. G*dd#mn desnick, she said. From then on, all of us called little pieces of lint “desnicks.” The lead player even bought a small fuzzy puppy whom she named Desnick. Thirty years later, we all still use the term and the people who have been close to each of us over the years have adopted it as well.
A different band mate misheard a reference to LED lights on a piece of equipment and thought the speaker had referenced the “diddly-dee lights.” We still call them diddly-dee lights.
My ex hated clutter. When she would go off about anything she deemed to be clutter, it would start an argument. I don’t know what self-help/fix your relationship book she read, but one day she referenced all the “happy stacks.” I looked at her quizzically, busted out laughing and we worked through the issue for the first time. I still call them happy stacks (I still have them and she is an EX!)!