A handjob given to the driver of a car on the highway. Best if done at night to avoid onlookers, but truckers will see you anyway.
We did not have anything to do for the 5 hour drive home, so I convinced my girl to give me a highway handy. It killed some time, but now we have to clean the steering wheel.
The act of receiving a hand job by the passenger while riding a motorcycle down the highway.
Should of been there bro! I went for a ride on the bike last night and a bar fly gave me the best highway handy!