There used to be a racehorse called Sabin du Loir and I loved the words so much I would say them to myself. One year we had a French student stay with us whose English wasn’t very good and she was very shy and we were really struggling to communicate with each other.I told her of my love of the words Sabin du Loir hoping she would understand what I meant. She then said to me ‘ I have a favourite English phrase that I love ‘all things change’. After that, although my French was pretty bad along with her English we just seemed to get on with each other at a different level. I realised that she loved films so we spent the rest of her stay watching films and going to the cinema.
I have two, the polite one is Tintinntabulation. Only ever seen it written, never used it in conversation and probably never will. The other is cockwomble. I find myself using it or at least thinking it, more and more as I age.