ravioli rumbles is when you have the deep unrelenting need to have some ravioli. preferably chef Boyardee
Dave: What do you want for dinner tonight John?
John: I think I have the ravioli rumbles
Dave: I'll get the chef Boyardee
Terminal velocity is when you are diagnosed with going the maximum speed in a defined direction using only gravitational potential. It is life threatening as it is a terminal disease.
Paul: What's wrong?
Kevin: I've been diagnosed
Paul: With what?
Kevin: Terminal Velocity.