gabbering fabberwaltz
An atrociously performed dance, usually done when one is incredibly drunk or held at gunpoint. Also can be used in exclamation at something bizarre or just plain stupid. The g and f can be alternated to form fabbering gabberwaltz.
*As a man dressed as Chubacca comes ploughing down the sidewalk armed with a spatula and singing Jerusalem*

"What the gabbering fabberwaltz is that?!"