bumpy road
what a guy drives down when his date has big boobs (only for his own horny satisfaction)
Tony recently took Asia out to dinner. On the way back he took her on a "detour" along several bumpy roads. Tony paid little attention to the road, for he was watching her huge tits bounce while he licked his lips.
bumpy road boner
When you're driving along a bumpy road, and the constant bumping around makes your body get confused due to all the penis flopage occuring within your pants, and to your surprise you get a boner. Also known as a "brb."
While taking the buggy for a spin I got a bumpy road boner and had to lie about why I didn't want to get up from the drivers seat. "I'm just checking the gauges," I said.