Born and raised in Connecticut, lived in New Hampshire, Florida, New Mexico, California and now Illinois and I've never heard the term "rumble bumps" though that term is now a part of my vocabulary that I intend to use at every appropriate opportunity.

On a semi-related sidenote: When I was stationed in Panama, I occasionally drove over a dead policeman in the road.

No, really! The term "dead policeman" (in Spanish, natch) is what they call speed bumps down there, even on traffic signs since, like the police, they control speeders. They just aren't breathing...