A term used by British soldiers during WWII whenever a loaded and cocked sten gun was dropped. The impact would cause it to fire in every directions until the magazine would be empty.
Soldier 1: theres at least 3 Germans in that house.
Soldier 2 : *tosses Sten in the house*
Soldier 1: Looks like there was 3 Germans in that house.
Soldier 2: Sten Dancing 😎