Cock Highway 

When he or she is missing just enough teeth to slide your wiener in and not get bit.

I was kinda scared to get a blowie off of her until she smiled. I'm gonna ride that cock highway all the way across the country with no worries about the tooth drag.

Cock Highway by Mikaela Slopko July 30, 2019

Highway Hard Cock 

When you are sleeping on a road trip on your stomach and you wake up with a boner because of the bumps.

Andrew Davis has Highway Hard Cock

Highway Hard Cock by pico April 9, 2003