I have found myself twiddling my thumbs and seen others do it but wanted to know more so I googled.
This is one definition:
- rotate one's thumbs around each other with the fingers linked together. There is much information – how to do it (one way or both ways), reason(s) – lots!, history/modern expression/ , videos, photos of thumb twiddlers.
Thing is, I had a thumb twiddler, a wooden one, no longer have it, but was interested in pursuing this further.
Will let you know if I find one online.