The term “slung shot” historically refers to a weight woven into a thin line used to toss a cord from one ship to another, which was then use to pull a heavier line over.
Legal use nowadays is in reference to any weight attached to any cord, designed to be used as a weapon.
Bikers have been know to carry a heavy padlock in the back pocket with a bandanna pulled through it. If a cop approaches, grab one end and pull only the bandanna out of the pocket, and blow your nose.
Need to crack a skull, pull both sides of the bandanna and out comes a cranium crusher at high speed.
Wow, interesting.
Seems to me though that reaching for your back pocket during an altercation in order to produce a homemade weapon is a great way to end up bringing a slung shot to a gunfight.
We actually had commercial "monkey fists" for throwing lines between amphibious vehicles in the water. They definitely help.