Steam jackhammer Share definition Flag The sexual act of defecating on a subjects chest, followed by rapidly inserting a penis into the feces pile. I gave her the steam jackhammer, she was ok with it until I finished her off with a dirty Sanchez. Steam jackhammer by Sexual seductor February 12, 2013 0 0 Get merch Get the Steam jackhammer mug. Buy Now — $32.95 See more merch