If you timing belt jumped you car would run like crap. Why don't you try to turn it on to see where the noise is coming from (oil pan, front, heads, tranny, exhaust). It could be that your crank broke. could be your exhaust hitting something. Could be a thrown rod.
But, don't debate waht it could/could not be until you go check stuff. Its hard enough to diagnose a noise over the interweb, go get us soem more info so we can help you.