A condition of vague physical uneasiness, seeking relief in irregular bodily movements. Apparently first used in the fidget(s (now always plural)…

Fidgeting; uneasy behaviour.

The action or habit of fidgeting; the state of being fidgety: in to be in a fidge; also, a commotion, stir, fuss.

The state or quality of being fidgety; nervous restlessness, uneasiness.