1) The act of orally pleasing a girl while she is driving

2) Smoking weed while driving resulting in an instantaneous trip to McDonalds.
1) Joel: Hey will you give me road head?

Rae: Only if you give me road munchies. I won't get you off unless you get me off.

2) Joel: Dude, I'm so high right now.

Dave: Ya man, I got some serious road munchies. Let's go to Taco Bell
by DirtyDave69 July 18, 2012
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Food you purposely buy to eat while driving. Not necessarily a road trip, could just be back and forth between work and home, etc.
I'm going to stop by a convenience store and pick up some Road Munchies before I head out to the concert.
by Storm filled Eyes March 26, 2019
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