When you have a roadboner
and decide to go ahead and make it better. Usually done on a less-traveled road, or when in a large vehicle not easily seen into. (A rig
or large truck
Usually pretty intense, since the element of exhibitionism
is there in force.
Also, be sure to have a handrag or burger king napkin handy.
Damn, I got a roadboner after seeing that cuteass
at that last stoplight. I guess I better jerk off
as I drive. Classic Roadsterbation.