twiddling
twid-dling
verb
Idly turning or fiddling with something small, often aimlessly.
"He was twiddling his thumbs, waiting for the bus."
noun
The act of idly turning or fiddling with something small.
"All that twiddling achieved nothing useful."
Thesaurus
Synonyms: twiddle, fiddle with, swirl, twirl, whirl