Definition of washboarding:
(n) :
The appearance of ripples or bumps on a dirt or gravel road, caused by wear from traffic, erosion, or poor grading.
(n) :
A streaky appearance on solid patches of color printed on corrugated materials, resulting from the uneven pressure exerted due to corrugations.
(n) :
(bees) An unexplained behavior in which bees move across the surface of their hive with a rocking motion.