The dance is first literal and then metaphorical.
I see you dancing; hopping around and squirming. I ask, “Do you need to go to the toilet?”
You reply: “No”
I then say “I’m pretty sure you need to go to the toilet”
You still reply “No,”
Then later I see a wet patch on your pants and say “You did need to go to the toilet, didn’t you?”
“Yes, mum” you reply.