"What will result from a combination of a sturdy crowbar, weight plates and electricity? Follow the instructions below and you will have a chance to see for yourself. There's not much effort you'll need to put into this and the effect you get will be a blast, I swear."
In the main game it is found in the Jungle in the River Village in Matutero's hut on the shelf beside the Workbench. This Mod is also available in Ryder White's Campaign, you can find it soon after the helicopter crash, in plain sight, inside a metal box on the upper levels where you have to jump from ledge to ledge of the first area (it's impossible to miss it).