DWI legal definition of DWI TheFreeDictionary.com. WebDWI. An abbreviation for driving while intoxicated, which is an offense committed by an individual who operates a motor vehicle while under the influence of alcohol or Drugs and Narcotics. An.
Webˌdē-ˌdə-bəl- (ˌ)yü-ˈī. plural DWIs. 1. US : the crime of driving a vehicle while intoxicated : dui. was arrested for DWI..