get ants in the/(one's) pants
To become unable to sit still, due to anxiety, excess energy, or impatience. The kids usually get ants in the pants today around this time of day, so I'm going to take them to the playground. A: "Why is Carrie pacing around the office?" B: "She's waiting for her doctor to call, so she's got ants in her pants." They're toddlers, they get ants in their pants constantly. Good luck keeping up with them!
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