gack dancer
Someone so wasted on meth they dance like they're possessed and their body is going to fall apart. Their arms swing like they're fighting a ghost and their butt moves like it has a life of its own.
My mom started dancing in the grocery store like she was in a horror movie.
My friend danced in the parking lot like he was trying to escape a zombie.
My uncle did the Elaine dance in the middle of the pizza shop.