What it means
Means someone's so restless, twitchy, excited, or wound up they can't sit still for two seconds. It's usually said in a playful way, especially to kids who are wriggling all over the place. In British English it gets an extra cheeky giggle because pants can mean underwear too.
Usage examples
"Mum: Stop wriggling, you’ve got ants in your pants. We’re in the queue for chips, calm down or you’ll spill the vinegar."
"The kids had ants in their pants all morning waiting for the trip, bouncing off the walls before the bus arrived."
"He has had ants in his pants since the interview, can’t sit through dinner without checking his phone for the email."
"You’ve got ants in your pants today, haven’t you? Sit down and finish your chips before you start orbiting the table."
"The whole class had ants in their pants on the last day of term, nobody was pretending to care about maths anymore."
Where it comes from
This idiom’s been kicking around in English since the early 1900s. The joke picture does all the heavy lifting: if you literally had ants in your pants, you’d be squirming, hopping about, and absolutely not sitting still. That goofy image made it stick, especially in playful chat with kids.
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