have ants in your pants
have ants in the/(one's) pants
1. To be unable to sit still, due to anxiety, excess energy, or impatience. The kids really have ants in the pants today, so I'm going to take them to the playground. A: "Why is Carrie pacing?" B: "She's waiting for her doctor to call, so she's had ants in her pants all day."
2. To be interested in or in pursuit of sexual activity. You've been single for awhile now—don't you have ants in the pants yet?
have ants in your pantsINFORMAL
If someone has ants in their pants, they cannot keep still. They all had ants in their pants, incapable of sitting in their seats for more than six minutes at a stretch.