Chicago Steamship
the act in which two or more individuals overpower another helpless individual so that one attacker may pull down his or her pants, spread his or her buttocks over the victim's face, and flatulate and/or defecate in the said face, often leading to asphyxiation of the victim
Melissa rounded the corner, going about her business, but as she did, she was helplessly attacked by Christian and Keith, who proceeded to pin her down and exchange roles in a perfectly executed Chicago Steamship. This, as do many Chicago Steamships, led to hospitalization.