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1.
The act of receiving a blow job while driving while snorting cocaine off of the top of the head of the girl who is giving you said blow job.
Dude, what's it called when you get road head and snort coke at the same time?

You mean Road Blow?
by Pashington L Dabs November 19, 2010
 
2.
to receive fallacia while driving; roadhead
I was on I-95 and my girl gave me a nice roadblow
by Ryan Babakian October 21, 2008
 
3.
The process of having your penis blown by your favorite slut while driving your car.
Shaun:Yo dude i heard you got some road blow yesterday.
Josh:Yeah man that slut latoya was all up on my wang yesterday!
by shaun/josh September 07, 2006