A rusty cannonball is when one passes wind into a sheet or an item of clothing and the item is thrown at someone.after the item hits them the item should"explode" and wreak havoc!!
Jimmy:I was chillin with connor the other night when I decided to fart in my shirt and rusty cannonball him.
Sean:aww man that's ruthless!!
Sean:aww man that's ruthless!!
by jimbob8jim March 26, 2008