As in the anime show Shin Chan (aka Crayon Shin Chan). Involves pulling down your pants, revealing your bare butt and dancing.

To bare your bum (or flip a moonie) to a passerby and give it a jiggle whilst you are at it

This term could be used to describe the action in which Subject A pulls down their pants to reveal a bare ass, and then does some sort of dance-motion whilst Subject B screams profusely and throws objects at Subject A's arse.

When your dog's arse gets itchy, usually after it drops a load, and then it drags its arse on the ground by its front legs.

what happens when you hear a totally sexy song in a club.