A Mexican Tornado is when you're screwing a girl from behind, then pull out, ejaculate into her hair, and push her down the stairs. The twirling motion of her hair with your jiz in it while she's tumbling down the stairs is what is known as a Mexican Tornado.
"How did Maria die?"
"Well she experienced one too many Mexican Tornados."
A group of 5 or more mexican landscapers with blowers and rakes on the side of the road creating a Tornado of leaves for all to pass through.
You're driving down a windy sidestreet when all of the sudden everything gets all crazy. Leaves are everywhere, you can't see clearly. You hear a loud obnoxious noise You are in the eye of a mexican tornado. Drive quickly but don't hit any of the mexican landscapers.