Drunk drivers who have lost their driver's license, and resort to driving on the side of the road on electric scooters, complete with foot pedals as means of transportation. As these electric scooters do not require insurance or a driver's license, this provides alcoholics a way to circumvent the loss of motor vehicle use privileges due to a DUI (driving under the influence). The scooters are slow, cumbersome and impede traffic.
"Hey look it's old Billy driving home from the liquor store on his DUI mobile"
"Aw crap, this old alky is holding up traffic with his DUI mobile"
"Careful, the guy up ahead on his DUI mobile is liquored up and swerving all over"