road hammer 

a long haul truck driver, or someone who likes to drive or take long road trips.

"Wow, Miami to DC without sleeping? Mike is such a road hammer!"

road hammer by bebe elle August 30, 2016

road hummer 

performing oral sex on a male whose is driving.

Hank," Can I get a road hummer while driving to our vacation spot?"

Sarah, " I don't know. Aren't road hummers dangerous? Your supposed to be driving."

road hummer by humina121212 May 25, 2008