verb / noun
twiddle
TWID-ul/ˈtwɪdl/
A small turning or fiddling motion.
A bored man twiddles a pencil between his fingers.

Etymology
Twiddle is of unknown origin, though the OED suggests an apparently onomatopoeic combination of twirling or twisting with trifling action. Its early meaning “play with idly” connects directly to turning or fiddling with something without purpose.
In context
I always like twiddle them around my thumb and finger and when I'm on the phone
More examples
- A quick twiddle of the knob brings the station into focus.
- She twiddles her ring while listening to the announcement.
- We sit twiddling our thumbs while we wait for instructions.
Forms
twiddle · twiddles · twiddled · twiddling