Good thing the legal system doesn't use the dictionary to define laws. I get that you wanted a quick explanation but at least use wikipedia or something. Then you would see that even drunk driving isn't enough in many states to get you on manslaughter unless you already had a suspended license.

A common use of the vehicular manslaughter laws involves prosecution for a death caused by driving under the influence of intoxicating substances (determined by excessive blood alcohol content levels set by individual U.S. states), although an independent infraction (such as driving with a suspended driver's license), or negligence, is usually also required.