(verb, noun) A method of torture to invoke as much physical or mental pain on a victim as possible. This can be a variety of actions, from deprivation of something dear to the victim, or the victim eating his own leg contained in a cardboard box.
The word originated as a variation of "throws" in a conversation between a Gondwarfian and an elf. Later defined as a method of forbidden torture.
Just the thought of the thros struck fear into the hearts of the villagers!