The word is “antsy”, which is derived from “ant”.

Antsy means itchy, or nervous, or agitated, as though you were dealing with or were covered by ants. Ants, when they swarm, can produce unpleasant feelings on your skin, even if they are not biting. This feeling can come many other causes, as your example shows.

Origin: 1950–55

–adjective, ants·i·er, ants·i·est. Informal.

1. unable to sit or stand still; fidgety: The children were bored and antsy.

2. apprehensive, uneasy, or nervous: I’m a little antsy since hearing those storm warnings.

– ants·i·ness, noun

(ānt’sē) Pronunciation Key

– adj. ant·si·er, ant·si·est Slang

Restless or impatient; fidgety: The long wait made the children antsy.

Nervous; apprehensive: “Camps got shot up all the time, but if there wasn’t a shoot-up, they’d get antsy” (Harper’s).

[Perhaps from the incessant motions of ants.]