An object used to "stuff" one's palm, which a fist is made around. Common items in this class are rolls of quarters, large bolts, lighters, etc. They should be fairly heavy, provide protection to the hand and do a great deal of damage, akin to brass knuckles, when they strike someone. Also advantageous because in certain jurisdictions, brass knuckles are illegal, whereas there is no crime in carrying an item such as this.
That queer Evan lipped me off, but after I broke his jaw and ruptured his eyeball with my stuffer, he never looked me in the eye again.