twiddle

Short definition from Wiktionary

Verb

1. 1
   To wiggle, fidget or play with; to move around.
2. 2
   To flip or switch two adjacent bits (binary digits).
3. 3
   To be in an equivalence relation with.
4. 4
   To play with anything; hence, to be busy about trifles.

Noun

1. 1
   A slight twist with the fingers.
2. 2
   A wiggling movement.
3. 3
   A small decorative embellishment.
4. 4
   A small musical flourish.
5. 5
   A tilde.
6. 6
   A drawn line that is curvy or twisted.
7. 7
   A tiny bit.
8. 8
   A tizzy.