To touch lightly, or play with; to tweedle; to twirl; as, to twiddle one's thumbs; to twiddle a watch key.

To play with anything; hence, to be busy about trifles.

manipulate, as in a nervous or unconscious manner; "He twiddled her thumbs while waiting for the interview"

A pimple.

A slight twist with the fingers.

a series of small (usually idle) twists or turns

turn in a twisting or spinning motion; "The leaves swirled in the autumn wind"