a "dancing nun"
A dancing nun is when a woman takes her pants off and starts shaking her crotch like it's a religious experience and everyone else is a sinner.
My teacher did a dancing nun in front of the entire class and I got detention.
My brother did a dancing nun in the middle of the grocery store and got yelled at by the manager.
I did a dancing nun in my bedroom and my dog stared at me like I was crazy.