Joliet Blackhammer means in slang: This is a *** job where 2 African Americans are killed and the bodies of their victims are sexed on. This is the name of the *** act that was performed following a double homicide in Joliet IL on January 10, 2013. Joliet Blackhammer was named after the Joliet Jackhammers, a former minor league baseball club. (in Slang Dictionary, added by Krystal Lester)