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.
My friend had brain surgery for an aneurysm, and every so often she fumbles a word as a result. One day she wanted to say the word lumberjacks, but her brain came up with logfarmers instead.