When throwing up into a toilet bowl, the contents of your puke hits the side of the bowl, causing it to look like a tornado of sorts as it swirls down into the water. Hence the name hurlnado.
Man 1: "I had a huge hurlnado after eating all that junkfood yesterday."
Man 2: "Yeah, I know how that feels."
Man 2: "Yeah, I know how that feels."
by Vinuash January 04, 2006