What is "sjamboking"

Usage examples of "sjamboking".

As if the entire day had come into being only to prepare him for this, he discovered a Bondel male, face down and naked, the back and buttocks showing scar tissue from old sjambokings as well as more recent wounds, laid open across the flesh like so many toothless smiles.

Before the other trooper had really taken it in, the fellow they'd been sjamboking leaped on Fleische, trying to get his bight of chain around Fleische's neck.