I have, twice that I can remember.
- Nukamajig - microwave. I still use it from time to time because it’s too stupid not to.
- Miscombobulate - mixup and confuse. Just now, between the time it was and when the appartment building’s laundry room was closed for the night.
A friend went through a lot of relationships last year and at one point I just lost track of their names so I started calling them a random woman’s name which stuck, and now the whole group of friends refers to his various love interests with that name.