Your search for "electronic jamming" found the following result:

"Electronic jammer" - This item resembles a jam jar with a strange electronic device attached to the bottom with a glass dome containing a blackcurrent. When activated the jam jar projects a continuous amount of jam of whatever fruit is placed in the bottom dome. It has settings to change the consistancy, and the force at which the jam comes forth, ranging between just keeping the jar filled, to a water-canon strength blast.