Grandpa Driver 

Any driver, elderly or not, who exhibits driving traits such as not driving at least the speed limit, stopping at railroad tracks, not turning right on red, driving the speed limit in the left lane of a highway, being unable to navigate a roundabout, or otherwise causing unnecessary delays for other drivers. However, it is debatable if a Grandpa Driver is worse than a Dick Driver.

I was late to work today because some Grandpa Driver went 20 in a 45 for five miles.

Grandpa Driver by Isaristh November 6, 2013

grandma driver 

hands at 10 & two on the steering wheel and hunched over to see out the windshield

Chris Craig is a grandma driver when he goes on roadtrips

grandma driver by dictionarious December 18, 2008

Just Fuckin Drive Grandma 

Basically means, just do it. Just go. When someone is taking far too long and holding up your life for no known reason, you would say this to them. When sitting in the car, and waiting for another person who is not yet in the car and you just want to go.

Grandma would not get going so I said "Just Fuckin Drive Grandma."

Just Fuckin Drive Grandma by Toothless McGee December 7, 2018