go-devil

noun4

1. •
   (US) A weight which is dropped into a bore, as of an oil well, to explode a cartridge previously lowered.
2. •
   (US) A device, such as a loosely fitted plug, which is driven through a pipe by the pressure of the contents behind the plug to clear away obstructions.
3. •
   (US) A rough sled or dray used for dragging or hauling loads.
4. •
   (US, informal) A gadget or unspecified device, in various industries.

   • He had three wagonloads of go-devil squibs he wanted to sell, you know, these little oil-well torpedoes, hold about a quart of nitro each? Beautiful. — 2006